d a r k & d o p e - Darkchecker

Overview

Snoop Summary for darkchecker.net

This is a free and comprehensive report about darkchecker.net. The domain darkchecker.net is currently hosted on a server located in United States with the IP address 104.27.172.196, where the local currency is USD and English is the local language. If darkchecker.net was to be sold it would possibly be worth $667 USD (based on the daily revenue potential of the website over a 24 month period). Darkchecker.net receives an estimated 316 unique visitors every day - a decent amount of traffic! This report was last updated 2nd May, 2020.

About darkchecker.net

Site Preview:
Title:	d a r k & d o p e
Description:
Keywords and Tags:
Related Terms:
Fav Icon:
Age:
Domain Created:
Domain Updated:
Domain Expires:

Review

Snoop Score

1/5

Valuation

$667 USD

Note: All valuation figures are estimates.

Popularity

Low

Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank:	4,351,048
Alexa Reach:	<0.0001%
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority:	0
Moz Page Authority:	0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors:	316
Monthly Visitors:	9,618
Yearly Visitors:	115,340

Note: All visitors figures are estimates.

Visitors By Country

Revenue

Daily Revenue:	$1 USD
Monthly Revenue:	$27 USD
Yearly Revenue:	$329 USD

Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top Ranking Keywords (US)

Domain Analysis

	Value	Length
Domain:	darkchecker.net	15
Domain Name:	darkchecker	11
Extension (TLD):	net	3

Page Speed Analysis

Average Load Time:
Load Time Comparison:

Avg. (All Categories)

Performance

Accessibility

Best Practices

SEO

Progressive Web App

0–49 (Fail) 50–89 (Average) 90–100 (Pass)

Simulate loading on desktop

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for darkchecker.net. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 0.6 s
The time taken for the first image or text on the page to be rendered.

First Meaningful Paint — 0.6 s
The time taken for the primary content of the page to be rendered.

Time to Interactive — 0.6 s
The time taken for the page to become fully interactive.

First CPU Idle — 0.6 s
The time taken for the page's main thread to be quiet enough to handle input.

Max Potential First Input Delay — 20 ms
Users could experience a delay when interacting with the page.

Other

Estimated Input Latency — 10 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive darkchecker.net as laggy when the latency is higher than 0.05 seconds.

Total Blocking Time — 0 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Network Requests
Below is a list of network requests that were made during page load.

URL	Start Time (Ms)	End Time (Ms)	Transfer Size (Bytes)	Resource Size (Bytes)	Status Code	MIME Type	Resource Type
http://darkchecker.net/	0	648.02700001746	3854	15725	200	text/html	Document
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	659.46300001815	684.16099995375	20205	121200	200	text/css	Stylesheet
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css	659.81000009924	680.55399996229	3240	23409	200	text/css	Stylesheet
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	659.93999992497	677.06000013277	10303	37045	200	text/javascript	Script
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	660.05700011738	667.75000002235	34621	97163	200	text/javascript	Script
http://darkchecker.net/path/js/custom.js	660.22199997678	1095.1209999621	1899	6335	200	application/javascript	Script
http://darkchecker.net/path/js/priv8explicitchk.js	660.32900009304	1124.6559999418	2726	12387	200	application/javascript	Script
http://darkchecker.net/path/css/bootstrap.css	660.48400010914	1111.2999999896	21602	152840	200	text/css	Stylesheet
http://darkchecker.net/path/css/animate.css	660.69600009359	1561.9550000411	4793	75599	200	text/css	Stylesheet
http://darkchecker.net/path/css/explicitchk.css	660.90700007044	1512.27200008	7685	48910	200	text/css	Stylesheet
http://darkchecker.net/path/css/font-awesome.min.css	661.31999995559	1326.8500000704	6882	29065	200	text/css	Stylesheet
http://darkchecker.net/path/sound/blop.mp3	1152.204999933	1569.1239999142	2383	1992	206	audio/mpeg	Media
http://darkchecker.net/path/sound/bot.mp3	1153.1320000067	1595.7410000265	8749	8358	206	audio/mpeg	Media
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	1590.2700000443	2401.8069999292	72268	71896	200	font/woff2	Font

Show Details

Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.

Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.

Tasks
Below is a list of the top-level main thread tasks that executed during page load.

Start Time (Ms)	End Time (Ms)
676.718	6.409
711.04	7.381
718.633	26.792
1151.563	12.273
1163.881	14.16
1593.835	58.374
2429.151	20.311

Show Details

Diagnostics
Below is a collection of useful page vitals.
View Data

Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Darkchecker.net should consider serving more appropriate-sized images.

Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Darkchecker.net should consider lazy-loading offscreen and hidden images.

Minify CSS — Potential savings of 3 KB
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Darkchecker.net should consider minifying CSS files.

URL	Size (Bytes)	Potential Savings (Bytes)
http://darkchecker.net/path/css/bootstrap.css	21602	3475

Show Details

Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Darkchecker.net should consider minifying JS files.

Remove unused CSS — Potential savings of 39 KB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Darkchecker.net should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.

URL	Size (Bytes)	Potential Savings (Bytes)
http://darkchecker.net/path/css/bootstrap.css	21602	20762
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205	19403

Show Details

Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.

Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.

Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.

Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.

Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. Darkchecker.net should avoid multiple or unnecessary page redirects.

Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.

Diagnostics

Avoids enormous network payloads — Total size was 196 KB
Large network payloads can cost users money and are linked to long load times.

URL	Size (Bytes)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	72268
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	34621
http://darkchecker.net/path/css/bootstrap.css	21602
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	10303
http://darkchecker.net/path/sound/bot.mp3	8749
http://darkchecker.net/path/css/explicitchk.css	7685
http://darkchecker.net/path/css/font-awesome.min.css	6882
http://darkchecker.net/path/css/animate.css	4793
http://darkchecker.net/	3854

Show Details

Avoids an excessive DOM size — 86 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.

Statistic	Element	Value
Total DOM Elements		86
Maximum DOM Depth	SHOW DETAILS	9
Maximum Child Elements	SHOW DETAILS	7

Show Details

Avoid chaining critical requests — 10 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Darkchecker.net should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.

JavaScript execution time — 0.0 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

URL	Total CPU Time (Ms)	Script Evaluation (Ms)	Script Parse (Ms)
Other	118.173	4.029	0.969
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	82.025	32.01	2.466

Show Details

Minimizes main-thread work — 0.2 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

Category	Time Spent (Ms)
Other	65.775
Style & Layout	55.694
Script Evaluation	42.356
Parse HTML & CSS	27.174
Rendering	12.081
Script Parsing & Compilation	6.506

Show Details

Keep request counts low and transfer sizes small — 14 requests • 196 KB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.

Resource Type	Requests	Transfer Size (Bytes)
Total	14	201210
Font	1	72268
Stylesheet	6	64407
Script	4	49549
Media	2	11132
Document	1	3854
Image	0	0
Other	0	0
Third-party	4	68369

Show Details

Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.

Third-Party	Size (Bytes)	Main-Thread Blocking Time (Ms)
SHOW DETAILS	34621	0
SHOW DETAILS	33748	0

Show Details

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.

Metrics

Speed Index — 1.4 s
The time taken for the page contents to be visibly populated.

Opportunities

Eliminate render-blocking resources — Potential savings of 460 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Darkchecker.net should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.

URL	Size (Bytes)	Potential Savings (Ms)
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205	310
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css	3240	230
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	10303	270
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	34621	350
http://darkchecker.net/path/js/custom.js	1899	70
http://darkchecker.net/path/js/priv8explicitchk.js	2726	110
http://darkchecker.net/path/css/bootstrap.css	21602	230
http://darkchecker.net/path/css/animate.css	4793	150
http://darkchecker.net/path/css/explicitchk.css	7685	150
http://darkchecker.net/path/css/font-awesome.min.css	6882	150

Show Details

Preload key requests — Potential savings of 130 ms
Key requests can be preloaded by using '<link rel=preload>'. Darkchecker.net should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.

URL	Potential Savings (Ms)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	130

Show Details

Diagnostics

Serve static assets with an efficient cache policy — 9 resources found
Darkchecker.net can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.

URL	Cache TTL (Ms)	Size (Bytes)
http://darkchecker.net/path/sound/bot.mp3	0	8749
http://darkchecker.net/path/sound/blop.mp3	0	2383
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	14400000	72268
http://darkchecker.net/path/css/bootstrap.css	14400000	21602
http://darkchecker.net/path/css/explicitchk.css	14400000	7685
http://darkchecker.net/path/css/font-awesome.min.css	14400000	6882
http://darkchecker.net/path/css/animate.css	14400000	4793
http://darkchecker.net/path/js/priv8explicitchk.js	14400000	2726
http://darkchecker.net/path/js/custom.js	14400000	1899

Show Details

Opportunities

Reduce server response times (TTFB) — Root document took 650 ms
Time to First Byte (TTFB) identifies the time at which the server sends a response.

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.

URL	Potential Savings (Ms)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	811.53699988499

Show Details

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of darkchecker.net. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.

The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.

No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.

`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.

Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.

`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.

`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.

`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.

`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.

Audio and video

`<audio>` elements contain a `<track>` element with `[kind="captions"]`
Darkchecker.net may provide assistance to deaf or hearing-impaired users with captions on audio elements.

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Darkchecker.net may provide assistance to deaf or hearing-impaired users with captions on videos.

`<video>` elements contain a `<track>` element with `[kind="description"]`
Darkchecker.net may provide relevant information that dialogue cannot, by using audio descriptions.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.

Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.

Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.

Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.

Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.

List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.

Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.

`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Best practices

`[id]` attributes on the page are unique
It is advised to keep all id attributes unique in order to prevent instances from being overlooked by screen readers and other assistive technologies.

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.

`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Internationalization and localization

`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.

`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.

Failing Elements
textarea
input

Show Details

Internationalization and localization

`<html>` element does not have a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.

Failing Elements
html

Show Details

Names and labels

Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.

Failing Elements
textarea
input

Show Details

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.

Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.

Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.

The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.

User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.

Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.

Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.

Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.

Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.

Headings don't skip levels
Ensure that headings create an outline for the page and that heading levels are not skipped.

HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that darkchecker.net should incorporate. This includes practices such as protecting pages with HTTPS.

Passing (10)
Failing (4)

Other

Avoids Application Cache
Application cache is deprecated and is no longer recommended.

Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.

Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.

Name	Version
jQuery	1.12.4
jQuery (Fast path)

Show Details

Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.

Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.

Other

Does not use HTTPS — 10 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.

Insecure URL
http://darkchecker.net/
http://darkchecker.net/path/js/custom.js
http://darkchecker.net/path/js/priv8explicitchk.js
http://darkchecker.net/path/css/bootstrap.css
http://darkchecker.net/path/css/animate.css
http://darkchecker.net/path/css/explicitchk.css
http://darkchecker.net/path/css/font-awesome.min.css
http://darkchecker.net/path/sound/blop.mp3
http://darkchecker.net/path/sound/bot.mp3
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3

Show Details

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Includes front-end JavaScript libraries with known security vulnerabilities — 2 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Library Version	Vulnerability Count	Highest Severity
SHOW DETAILS	2	Medium

Show Details

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.

URL	Description
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	Error: Bootstrap's JavaScript requires jQuery at https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js:6:37

Show Details

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for darkchecker.net. This includes optimizations such as providing meta data.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.

Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.

Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.

Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.

robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.

Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of darkchecker.net. This includes details about web app manifests.

Fast and reliable

Page load is fast enough on mobile networks
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.

Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Fast and reliable

Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.

`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 10 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.

Insecure URL
http://darkchecker.net/
http://darkchecker.net/path/js/custom.js
http://darkchecker.net/path/js/priv8explicitchk.js
http://darkchecker.net/path/css/bootstrap.css
http://darkchecker.net/path/css/animate.css
http://darkchecker.net/path/css/explicitchk.css
http://darkchecker.net/path/css/font-awesome.min.css
http://darkchecker.net/path/sound/blop.mp3
http://darkchecker.net/path/sound/bot.mp3
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3

Show Details

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.

Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Does not redirect HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data

Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data

Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of darkchecker.net on mobile screens.

Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.

Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.

Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.

Avg. (All Categories)

Performance

Accessibility

Best Practices

SEO

Progressive Web App

0–49 (Fail) 50–89 (Average) 90–100 (Pass)

Simulate loading on mobile

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for darkchecker.net. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 2.4 s
The time taken for the first image or text on the page to be rendered.

First Meaningful Paint — 2.4 s
The time taken for the primary content of the page to be rendered.

Speed Index — 3.1 s
The time taken for the page contents to be visibly populated.

Time to Interactive — 2.4 s
The time taken for the page to become fully interactive.

First CPU Idle — 2.4 s
The time taken for the page's main thread to be quiet enough to handle input.

Max Potential First Input Delay — 110 ms
Users could experience a delay when interacting with the page.

Other

Estimated Input Latency — 10 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive darkchecker.net as laggy when the latency is higher than 0.05 seconds.

Total Blocking Time — 70 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Network Requests
Below is a list of network requests that were made during page load.

URL	Start Time (Ms)	End Time (Ms)	Transfer Size (Bytes)	Resource Size (Bytes)	Status Code	MIME Type	Resource Type
http://darkchecker.net/	0	643.87000002898	3885	15725	200	text/html	Document
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	657.44400001131	726.89000004902	20205	121200	200	text/css	Stylesheet
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css	657.73400012404	675.05900003016	3240	23409	200	text/css	Stylesheet
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	658.06200006045	714.70699994825	10303	37045	200	text/javascript	Script
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	658.26299996115	665.62000010163	34622	97163	200	text/javascript	Script
http://darkchecker.net/path/js/custom.js	658.76200003549	683.44600009732	1907	6335	200	application/javascript	Script
http://darkchecker.net/path/js/priv8explicitchk.js	659.06900004484	678.30900009722	2727	12387	200	application/javascript	Script
http://darkchecker.net/path/css/bootstrap.css	659.68400007114	700.86600002833	21603	152840	200	text/css	Stylesheet
http://darkchecker.net/path/css/animate.css	659.78300012648	701.6869999934	4801	75599	200	text/css	Stylesheet
http://darkchecker.net/path/css/explicitchk.css	660.17000004649	702.46900012717	7693	48910	200	text/css	Stylesheet
http://darkchecker.net/path/css/font-awesome.min.css	660.35700007342	685.00400008634	6890	29065	200	text/css	Stylesheet
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	797.41600016132	1630.5289999582	72268	71896	200	font/woff2	Font
http://darkchecker.net/path/sound/blop.mp3	872.84300010651	1274.6129999869	2383	1992	206	audio/mpeg	Media
http://darkchecker.net/path/sound/bot.mp3	873.89799999073	1279.9150000792	8749	8358	206	audio/mpeg	Media

Show Details

Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.

Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.

Tasks
Below is a list of the top-level main thread tasks that executed during page load.

Start Time (Ms)	End Time (Ms)
675.931	7.569
756.641	7.178
763.854	98.732
862.653	38.974
902.621	6.634
1660.185	18.352

Show Details

Diagnostics
Below is a collection of useful page vitals.
View Data

Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Darkchecker.net should consider serving more appropriate-sized images.

Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Darkchecker.net should consider lazy-loading offscreen and hidden images.

Minify CSS — Potential savings of 3 KB
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Darkchecker.net should consider minifying CSS files.

URL	Size (Bytes)	Potential Savings (Bytes)
http://darkchecker.net/path/css/bootstrap.css	21603	3475

Show Details

Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Darkchecker.net should consider minifying JS files.

Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.

Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.

Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.

Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.

Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. Darkchecker.net should avoid multiple or unnecessary page redirects.

Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.

Diagnostics

Avoids enormous network payloads — Total size was 197 KB
Large network payloads can cost users money and are linked to long load times.

URL	Size (Bytes)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	72268
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	34622
http://darkchecker.net/path/css/bootstrap.css	21603
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	10303
http://darkchecker.net/path/sound/bot.mp3	8749
http://darkchecker.net/path/css/explicitchk.css	7693
http://darkchecker.net/path/css/font-awesome.min.css	6890
http://darkchecker.net/path/css/animate.css	4801
http://darkchecker.net/	3885

Show Details

Avoids an excessive DOM size — 86 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.

Statistic	Element	Value
Total DOM Elements		86
Maximum DOM Depth	SHOW DETAILS	9
Maximum Child Elements	SHOW DETAILS	7

Show Details

Avoid chaining critical requests — 10 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Darkchecker.net should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.

JavaScript execution time — 0.1 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

URL	Total CPU Time (Ms)	Script Evaluation (Ms)	Script Parse (Ms)
Other	526.928	13.46	4.268
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	330.396	120.68	9.06

Show Details

Minimizes main-thread work — 0.9 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

Category	Time Spent (Ms)
Other	352.356
Style & Layout	208.46
Script Evaluation	152.532
Parse HTML & CSS	110.984
Rendering	38.056
Script Parsing & Compilation	24.844

Show Details

Keep request counts low and transfer sizes small — 14 requests • 197 KB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.

Resource Type	Requests	Transfer Size (Bytes)
Total	14	201276
Font	1	72268
Stylesheet	6	64432
Script	4	49559
Media	2	11132
Document	1	3885
Image	0	0
Other	0	0
Third-party	4	68370

Show Details

Minimize third-party usage — Third-party code blocked the main thread for 90 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.

Third-Party	Size (Bytes)	Main-Thread Blocking Time (Ms)
SHOW DETAILS	34622	91.996
SHOW DETAILS	33748	0

Show Details

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.

Opportunities

Remove unused CSS — Potential savings of 39 KB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Darkchecker.net should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.

URL	Size (Bytes)	Potential Savings (Bytes)
http://darkchecker.net/path/css/bootstrap.css	21603	20790
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205	19428

Show Details

Preload key requests — Potential savings of 150 ms
Key requests can be preloaded by using '<link rel=preload>'. Darkchecker.net should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.

URL	Potential Savings (Ms)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	150

Show Details

Diagnostics

Serve static assets with an efficient cache policy — 9 resources found
Darkchecker.net can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.

URL	Cache TTL (Ms)	Size (Bytes)
http://darkchecker.net/path/sound/bot.mp3	0	8749
http://darkchecker.net/path/sound/blop.mp3	0	2383
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	14400000	72268
http://darkchecker.net/path/css/bootstrap.css	14400000	21603
http://darkchecker.net/path/css/explicitchk.css	14400000	7693
http://darkchecker.net/path/css/font-awesome.min.css	14400000	6890
http://darkchecker.net/path/css/animate.css	14400000	4801
http://darkchecker.net/path/js/priv8explicitchk.js	14400000	2727
http://darkchecker.net/path/js/custom.js	14400000	1907

Show Details

Other

First Contentful Paint (3G) — 4832 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Eliminate render-blocking resources — Potential savings of 1,730 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Darkchecker.net should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.

URL	Size (Bytes)	Potential Savings (Ms)
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css	20205	1230
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css	3240	930
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js	10303	1080
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js	34622	1380
http://darkchecker.net/path/js/custom.js	1907	180
http://darkchecker.net/path/js/priv8explicitchk.js	2727	330
http://darkchecker.net/path/css/bootstrap.css	21603	1080
http://darkchecker.net/path/css/animate.css	4801	480
http://darkchecker.net/path/css/explicitchk.css	7693	630
http://darkchecker.net/path/css/font-awesome.min.css	6890	630

Show Details

Reduce server response times (TTFB) — Root document took 640 ms
Time to First Byte (TTFB) identifies the time at which the server sends a response.

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.

URL	Potential Savings (Ms)
http://darkchecker.net/path/fonts/fontawesome-webfont.woff2?v=4.6.3	833.11299979687

Show Details

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of darkchecker.net. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.

The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.

No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.

`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.

Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.

`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.

`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.

`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.

`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.

Audio and video

`<audio>` elements contain a `<track>` element with `[kind="captions"]`
Darkchecker.net may provide assistance to deaf or hearing-impaired users with captions on audio elements.

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Darkchecker.net may provide assistance to deaf or hearing-impaired users with captions on videos.

`<video>` elements contain a `<track>` element with `[kind="description"]`
Darkchecker.net may provide relevant information that dialogue cannot, by using audio descriptions.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.

Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.

Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.

Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.

Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.

List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.

Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.

`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Best practices

`[id]` attributes on the page are unique
It is advised to keep all id attributes unique in order to prevent instances from being overlooked by screen readers and other assistive technologies.

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.

`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Internationalization and localization

`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.

`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.

Failing Elements
textarea
input

Show Details

Internationalization and localization

`<html>` element does not have a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.

Failing Elements
html

Show Details

Names and labels

Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.

Failing Elements
textarea
input