HTML5
CSS3

        <a href="https://www.w3schools.com/html5" accesskey="h">HTML5</a>
<br>
<a href="https://www.w3schools.com/css3" accesskey="h">CSS3</a>

Ensures every accesskey attribute value is unique

accesskey attribute value must be unique

        <map name="primary">
    <area shape="circle" coords="75,75,75" href="left.html">
    <area shape="circle" coords="275,75,75" href="right.html">
</map>

Ensures <area> elements of image maps have alternate text

Active <area> elements must have alternate text

alert role

link role

        <div role="alert" aria-activedescendant="selected_option">alert role</div>
<div role="link" aria-selected="true">link role</div>

Ensures ARIA attributes are allowed for an element's role

Elements must only use allowed ARIA attributes

        <button role="blablabla"></button>

Ensures role attribute has an appropriate value for the element

ARIA role must be appropriate for the element

        <button role="doc-backlink"></button>

Ensures unsupported DPUB roles are only used on elements with implicit fallback roles

Unsupported DPUB ARIA roles should be used on elements with implicit fallback roles

NOT IMPLEMENTED

        <span style="color: #800000;">NOT IMPLEMENTED</span>

Ensures aria-hidden='true' is not present on the document body.

aria-hidden='true' must not be present on the document body

There is no required 'aria-checked' attribute for element with checkbox role

        <div role="checkbox">There is no required 'aria-checked' attribute for element with checkbox role</div>

Ensures elements with ARIA roles have all required ARIA attributes

Required ARIA attributes must be provided

Element with list role attribute should contain element with listitem role

        <div role="list">Element with list role attribute should contain element with listitem role</div>

Ensures elements with an ARIA role that require child roles contain them

Certain ARIA roles must contain particular children

Elements with role listitem should be contained in, or owned by, an element with the role list or group.

        <div role="listitem">Elements with role listitem should be contained in, or owned by, an element with the role list or group.</div>

Ensures elements with an ARIA role that require parent roles are contained by them

Certain ARIA roles must be contained by particular parents

composite is abstract role used for the ontology. This role shouldn't be used in content

        <div role="composite">composite is abstract role used for the ontology. This role shouldn't be used in content</div>

Ensures all elements with a role attribute use a valid value

ARIA roles used must conform to valid values

aria-hidden attribute value should be only true, false or undefined

        <div aria-hidden="rtue">aria-hidden attribute value should be only true, false or undefined</div>

Ensures all ARIA attributes have valid values

ARIA attributes must conform to valid values

aria-my-property is not valid aria property

        <div aria-my-property="true">aria-my-property is not valid aria property</div>

Ensures attributes that begin with aria- are valid ARIA attributes

ARIA attributes must conform to valid names

        <audio controls="" src="https://mdn.github.io/learning-area/html/multimedia-and-embedding/video-and-audio-content/viper.mp3">
    <track kind>
</audio>

Ensures <audio> elements have captions

<audio> elements must have a captions track

        <input type="hidden" autocomplete="on">
<input type="password" autocomplete="name">
<input type="url" autocomplete="new-password">
<input autocomplete="street-address">
<input type="date" autocomplete="cc-exp">
<input type="tel" autocomplete="cc-exp-month">
<input type="password" autocomplete="bday">
<input type="email" autocomplete="url">
<input type="url" autocomplete="tel">
<input type="number" autocomplete="email">
<input type="search">
<input type="password">
<input type="url">
<input type="email">
<input type="tel">
<textarea autocomplete="blablabla">Textarea</textarea>

Ensures autofill attribute is validated

Every autofill attribute is fitted appropriate value

Why would somebody use this?

        <blink>Why would somebody use this?</blink>

Ensures <blink> elements are not used

<blink> elements are deprecated and must not be used

        <button></button>
<span role="button"></span>
<input type="button">
<input type="submit">
<input type="reset">

Ensures buttons have discernible text

Buttons must have discernible text

NOT IMPLEMENTED

        <span style="color: #800000;">NOT IMPLEMENTED</span>
<a href="blablabla"></a>

Ensures each page has at least one mechanism for a user to bypass navigation and jump straight to the content

Page must have means to bypass repeated blocks

Cats
Dogs
Birds

        <div>
    <input type="checkbox" name="animal" value="Cat" />Cats
    <br />
    <input type="checkbox" name="animal" value="Dog" />Dogs
    <br />
    <input type="checkbox" name="animal" value="Bird" />Birds
    <br />
    <input type="submit" value="Submit now" />
</div>

Ensures related <input type="checkbox"> elements have a group and that that group designation is consistent

Checkbox inputs with the same name attribute value must be part of a group

Text with low contrast

        <div style="height: 100px; background: aliceblue; color: #eaf2f9;">
    <h2>Text with low contrast</h2>
</div>

Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds

Elements must have sufficient color contrast

Firefox
Mozilla Firefox: A free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers.

Non valid: <dt> tag should precede <dd> tag
Firefox

        <dl>
    <dt>Firefox</dt>
    <dt>Mozilla Firefox</dt>
    <dd>
        A free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers.
    </dd>
    <span>Non valid &lt;span&gt; tag inside &lt;dl&gt; tag</span>
</dl>

<dl>
    <dd>
        Non valid: &lt;dt&gt; tag should precede &lt;dd&gt; tag
    </dd>
    <dt>Firefox</dt>
</dl>

Ensures <dl> elements are structured correctly

<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script> or <template> elements

        <dt></dt>
<dd></dd>
<dd></dd>

Ensures <dt> and <dd> elements are contained by a <dl>

<dt> and <dd> elements must be contained by a <dl>

Empty <title> tag.

        Empty &lt;title&gt; tag.

Ensures each HTML document contains a non-empty <title> element

Documents must have <title> element to aid in navigation

Duplicate id item Duplicate id item 2

        <span id="duplicate-id">Duplicate id item</span>
<span id="duplicate-id">Duplicate id item 2</span>

Ensures every id attribute value is unique

id attribute value must be unique

        <h2></h2>

Ensures headings have discernible text

Headings must not be empty

        <iframe title="non-unique-title" src="http://example.com"></iframe>
<iframe title="non-unique-title" src="http://example.com"></iframe>

Ensures <iframe> and <frame> elements contain a unique title attribute

Frames must have a unique title attribute

        <iframe src="http://example.com"></iframe>

Ensures <iframe> and <frame> elements contain a non-empty title attribute

Frames must have title attribute

First heading level

Third heading level

        <h1>First heading level</h1>
<h3>Third heading level</h3>

Ensures the order of headings is semantically correct

Heading levels should only increase by one

hidden content hidden content

        <span style="display: 'none';">hidden content</span>
<span style="visibility: 'hidden';">hidden content</span>

Informs users about hidden content.

Hidden content on the page cannot be analyzed

Link with href attribute equal to hash symbol ('#')

        <a href="#">Link with href attribute equal to hash symbol ('#')</a>

Ensures that href values are valid link references to promote only using anchors as links

Anchors must only be used as links with valid URLs or URL fragments

Empty lang attributes of <html> tag.

        Empty lang attributes of &lt;html&gt; tag.

Ensures every HTML document has a lang attribute

<html> element must have a lang attribute

NOT IMPLEMENTED

        <span style="color: #800000;">NOT IMPLEMENTED</span>

Ensures the lang attribute of the <html> element has a valid value

<html> element must have a valid value for the lang attribute

        <img src="http://placehold.it/350x150">
<div role="img" style="background-image: url(http://placehold.it/350x150); width: 350px; height: 150px"></div>

Ensures <img> elements have alternate text or a role of none or presentation

Images must have alternate text

TEXT

text text

        <div id="imageRedundantAltAriaLabel">TEXT</div>

<button>
    <img alt="Button">
</button>

<button>
    <img alt="Button"> Button
</button>

<button>
    <input type="image" alt="Button">
</button>

<button>
    <input type="image" alt="Button"> Button
</button>

<button title="text">Text</button>

<a href="#" aria-label="text" title="Text"></a>

<button aria-labelledby="imageRedundantAltAriaLabel" title="Text"></button>

<label for="imageRedundantAltLabelViolations">text</label>
<a href="#" id="imageRedundantAltLabelViolations" title="Text"></a>

<label>
    text
    <button title="Text"></button>
</label>

Ensure button and link text is not repeated as image alternative

Text of buttons and links should not be repeated in the image alternative

        <input id="image" type="image" width="100" height="30" src="https://raw.githubusercontent.com/mdn/learning-area/master/html/forms/image-type-example/login.png">

Ensures <input type="image"> elements have alternate text

Image buttons must have alternate text

Accessible name

Visible Label Visible Label Visible Label Visible Label Visible Label Visible Label Visible Label Anchor Visible Label Anchor Visible Label Anchor Visible Label Anchor Visible Label Anchor Visible Label Anchor Anchor Anchor

        <div id="labelInNameDiv">Accessible name</div>

<label for="labelInNameInput1">Visible Label</label>
<input id="labelInNameInput1" aria-labelledby="labelInNameDiv">

<label for="labelInNameInput2">Visible Label</label>
<input id="ariaLabelInput2" aria-label="accessibleName">

<label for="labelInNameInput3">Visible Label</label>
<input id="labelInNameInput3" type="button" title="accessibleName">

<label>Visible Label
    <input aria-labelledby="labelInNameDiv">
</label>

<label>Visible Label
    <input aria-label="accessibleName">
</label>

<label>Visible Label
    <input type="button" title="accessibleName">
</label>

<label for="labelInNameAnchor1">Visible Label</label>
<a id="labelInNameAnchor1" aria-labelledby="labelInNameDiv" href="#">Anchor</a>

<label for="labelInNameAnchor2">Visible Label</label>
<a id="labelInNameAnchor2" aria-label="accessibleName">Anchor</a>

<label for="labelInNameAnchor3">Visible Label</label>
<a id="labelInNameAnchor3">Anchor</a>

<label>Visible Label
    <a aria-labelledby="labelInNameDiv" href="#">Anchor</a>
</label>

<label>Visible Label
    <a aria-label="accessibleName">Anchor</a>
</label>

<label>Visible Label
    <a>Anchor</a>
</label>

<a aria-labelledby="labelInNameDiv" href="#">Anchor</a>

<a aria-label="accessibleName">Anchor</a>

For user interface components with labels that include text or images of text, the name contains the text that is presented visually.

Accessible name matches or starts with visible label

        <form action="#">
    <div id="labelTitleOnlyLabel">Title</div>
    <div id="describedLabelTitleOnlyLabel">anotherTitle</div>

    <input title="title"
           aria-describedby="labelTitleOnlyLabel"
           aria-label="anotherTitle">Don't have both attribute "title" and "aria-describedby" on HTMLInputElement

    <input title="title"
           aria-describedby="labelTitleOnlyLabel"
           aria-label="Title">

    <textarea aria-labelledby="labelTitleOnlyLabel"
              aria-describedby="labelTitleOnlyLabel"></textarea>

    <input aria-describedby="labelTitleOnlyLabel"
           aria-label="Title">

    <label>title
        <select aria-describedby="labelTitleOnlyLabel"></select>
    </label>

    <textarea title="title"
              aria-labelledby="labelTitleOnlyLabel"></textarea>

    <input title="title"
           aria-label="Title">

    <label>title
        <input title="title">
    </label>
</form>

Ensures that every form element is not solely labeled using the title or aria-describedby attributes

Form elements should have a visible label

        <form action="/action_page.php">
    <label for="male">Male</label>
    <input type="radio" name="gender" id="male" value="male">
    <br>
    <input type="radio" name="gender" id="female" value="female">
    <br>
    <label for="other">Other</label>
    <input type="radio" name="gender" id="other" value="other">
</form>

Ensures every form element has a label

Form elements must have labels

Left block

Right block

presentation table

        <table role="presentation">
    <tr>
        <th>Left block</th>
        <th>Right block</th>
    </tr>
</table>

<table role="presentation">
    <caption>presentation table</caption>
    <tr>
        <td></td>
        <td></td>
    </tr>
</table>

<table role="presentation" summary="presentation table">
    <tr>
        <td></td>
        <td></td>
    </tr>
</table>

Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute

Layout tables must not use data table elements

Text Link with contract ratio to surrounding text below 3:1 Text

        <p>
    <span style="color: black">Text</span>
    <a style="text-decoration: none; color: black" href="#">Link with contract ratio to surrounding text below 3:1</a>
    <span style="color: black">Text</span>
</p>

Links can be distinguished without relying on color

Links must be distinguished from surrounding text in a way that does not rely on color

        <a href="https://nekitozzz.github.io/staticTestPage/index.htm"></a>

Ensures links have discernible text

Links must have discernible text

List element

Not list element

        <ul>
    <li>List element</li>
    <div>Not list element</div>
</ul>

Ensures that lists are structured correctly

<ul> and <ol> must only directly contain <li>, <script> or <template> elements

List item wrapped outside of <ul> or <ol> parent elements

        <li>List item wrapped outside of &lt;ul&gt; or &lt;ol&gt; parent elements</li>

Ensures <li> elements are used semantically

<li> elements must be contained in a <ul> or <ol>

<marquee> elements shouldn't be used

        <marquee>&lt;marquee&gt; elements shouldn't be used</marquee>

Ensures <marquee> elements are not used

<marquee> elements are deprecated and must not be used

NOT IMPLEMENTED (should be inside the <head> element)

        <span style="color: #800000;">NOT IMPLEMENTED (should be inside the &lt;head&gt; element)</span>

Ensures <meta http-equiv="refresh"> is not used

Timed refresh must not exist

NOT IMPLEMENTED (should be inside the <head> element)

        <span style="color: #800000;">NOT IMPLEMENTED (should be inside the &lt;head&gt; element)</span>

Ensures <meta name="viewport"> can scale a significant amount

Users should be able to zoom and scale the text up to 500%

NOT IMPLEMENTED (should be inside the <head> element)

        <span style="color: #800000;">NOT IMPLEMENTED (should be inside the &lt;head&gt; element)</span>

Ensures <meta name="viewport"> does not disable text scaling and zooming

Zooming and scaling must not be disabled

Anchor Anchor Anchor Anchor Input Input Input Input

        <a href="#" style="border: 1px solid red; outline: 1px solid #F2F0E6">Anchor</a>
<a href="#" style="border: 1px solid #F2F0E6; outline: 1px solid #E0FFFF">Anchor</a>
<a href="#" style="border: 1px solid #F2F0E6">Anchor</a>
<a href="#" style="outline: 1px solid #E0FFFF">Anchor</a>

<button style="border: 1px solid red; outline: 1px solid #F2F0E6">Button</button>
<button style="border: 1px solid #F2F0E6; outline: 1px solid #E0FFFF">Button</button>
<button style="border: 1px solid #F2F0E6">Button</button>
<button style="outline: 1px solid #E0FFFF">Button</button>

<input type="text" style="border: 1px solid red; outline: 1px solid #F2F0E6"> Input
<input type="text" style="border: 1px solid #F2F0E6; outline: 1px solid #E0FFFF"> Input
<input type="text" style="border: 1px solid #F2F0E6"> Input
<input type="text" style="outline: 1px solid #E0FFFF"> Input

<textarea style="border: 1px solid red; outline: 1px solid #F2F0E6">TEXTAREA</textarea>
<textarea style="border: 1px solid #F2F0E6; outline: 1px solid #E0FFFF">TEXTAREA</textarea>
<textarea style="border: 1px solid #F2F0E6">TEXTAREA</textarea>
<textarea style="outline: 1px solid #E0FFFF">TEXTAREA</textarea>

<select style="border: 1px solid red; outline: 1px solid #F2F0E6"><option>option</option></select>
<select style="border: 1px solid #F2F0E6; outline: 1px solid #E0FFFF"><option>option</option></select>
<select style="border: 1px solid #F2F0E6"><option>option</option></select>
<select style="outline: 1px solid #E0FFFF"><option>option</option></select>

A visual presentation must have a contrast ratio of at least 3:1 against adjacent color(s)

User Interface Components and Graphical Objects must have a contrast ratio of at least 3:1 against adjacent color(s)

        <object width="100" height="100" style="background: green"></object>

Ensures <object> elements have alternate text

Male Female

        <input type="radio" id="male" name="sex">
<label for="contactChoice2">Male</label>
<input type="radio" id="female" name="sex">
<label for="contactChoice2">Female</label>

Ensures related <input type="radio"> elements have a group and that the group designation is consistent

Radio inputs with the same name attribute value must be part of a group

Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text Some text

        <div style="width: 500px; overflow: scroll">
    <div style="width: 1000px">
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
        Some text Some text Some text Some text Some text Some text Some text Some text Some text
    </div> 
</div>

Content should be presented without requiring horizontal scrolling

Horizontal scrolling shouldn't be used if screen is wider than 320px

Not all content on this page contained within a landmark region

        <span>Not all content on this page contained within a landmark region</span>

Ensures all content is contained within a landmark region

Content should be contained in a landmark region

scope attribute in html5 should be used only on <th> element

        <table>
    <tr>
        <td scope="row">scope attribute in html5 should be used only on &lt;th&gt; element</td>
        <td>2</td>
    </tr>
</table>

Ensures the scope attribute is used correctly on tables

scope attribute should be used correctly

        <img ismap src="picture.jpeg">

Ensures that server-side image maps are not used

Server-side image maps must not be used

Header

Main

Header

SkipLink

Main

Header

SkipLink

Main

Header

SkipLink

Main

Header

SkipLink

Main

        <div class="fakeBodyElm">
    <header>Header</header>
    <nav>Navigation</nav>
    <main>Main</main>
</div>

<div class="fakeBodyElm">
        <header>Header</header>
        <a>SkipLink</a>
        <nav>Navigation</nav>
        <main>Main</main>
    </div>

<div class="fakeBodyElm">
    <header>Header</header>
    <a href="http://example.com/">SkipLink</a>
    <nav>Navigation</nav>
    <main>Main</main>
</div>

<div class="fakeBodyElm">
    <header>Header</header>
    <a href="#">SkipLink</a>
    <nav>Navigation</nav>
    <main>Main</main>
</div>

<div class="fakeBodyElm">
    <header>Header</header>
    <a href="#lostContent">SkipLink</a>
    <nav>Navigation</nav>
    <main>Main</main>
</div>

Ensures the first link on the page is a skip link

The page should have a skip link as its first link

        <input type="text" tabindex=3>

Ensures tabindex attribute values are not greater than 0

Elements should not have tabindex greater than zero

Concerts
Date	Event	Venue
12 Feb	Waltz with Strauss	Main Hall

Concerts

Date	Event	Venue

        <table summary="Concerts">
    <caption>Concerts</caption>
    <tr>
        <th>Date</th>
        <th>Event</th>
        <th>Venue</th>
    </tr>
    <tr>
        <td>12 Feb</td>
        <td>Waltz with Strauss</td>
        <td>Main Hall</td>
    </tr>
</table>

<figure>
    <figcaption>Concerts</figcaption>
    <table summary="Concerts">
        <tr>
            <th>Date</th>
            <th>Event</th>
            <th>Venue</th>
        </tr>
    </table>
</figure>

Ensure that tables do not have the same summary and caption

The <caption> element should not contain the same text as the summary attribute

colspan attribute instead of caption
Cell 2	Cell 3

        <table width="200" border="1" align="center" cellpadding="4" cellspacing="0">
    <tr>
        <td colspan="2" bgcolor="#FBF0DB">colspan attribute instead of caption</td>
    </tr>
    <tr>
        <td>Cell 2</td>
        <td>Cell 3</td>
    </tr>
</table>

Ensure that tables with a caption use the <caption> element.

Data or header cells should not be used to give caption to a data table.

Anchor

        <button type="button" style="width: 40px;">Button</button>
<input type="button" style="width: 40px;">
<div><a href="blablalbla">Anchor</a></div>
<div><img src="blablalbla" style="width: 40px;"></div>

Target size must be acceptable

The size of the target for pointer inputs is at least 44 by 44 CSS pixels

Header of 1st row	Header of 2nd row	Header of 3nd row
Cell 1	Cell 2	Cell 3	Cell 4
Cell 1	Cell 2	Cell 3	Cell 4
Cell 1	Cell 2	Cell 3	Cell 4
Cell 1	Cell 2	Cell 3

        <table width="200" border="1" align="center" cellpadding="4" cellspacing="0">
    <tr>
        <th>Header of 1st row</th>
        <th>Header of 2nd row</th>
        <th>Header of 3nd row</th>
    </tr>
    <tr>
        <td>Cell 1</td>
        <td>Cell 2</td>
        <td>Cell 3</td>
        <td>Cell 4</td>
    </tr>
    <tr>
        <td>Cell 1</td>
        <td>Cell 2</td>
        <td>Cell 3</td>
        <td>Cell 4</td>
    </tr>
    <tr>
        <td>Cell 1</td>
        <td>Cell 2</td>
        <td>Cell 3</td>
        <td>Cell 4</td>
    </tr>
    <tr>
        <td>Cell 1</td>
        <td>Cell 2</td>
        <td>Cell 3</td>
    </tr>
</table>

Ensure that each non-empty data cell in a large table has one or more table headers

All non-empty td element in table larger than 3 by 3 must have an associated table header

hello
goodbye

        <table>
    <tr>
        <th>
            <span id="hi">hello</span>
        </th>
    </tr>
    <tr>
        <td headers="hi">goodbye</td>
    </tr>
</table>

Ensure that each cell in a table using the headers refers to another cell in that table

All cells in a table element that use the headers attribute must only refer to other cells of that same table

Text
Text2

        <table>
    <tr>
        <th>Text</th>
    </tr>
    <tr>
        <th>Text2</th>
    </tr>
</table>

Ensure that each table header in a data table refers to data cells

All th element and elements with role=columnheader/rowheader must data cells which it describes

nonvalid lang attribute

        <span lang="nonvalid">nonvalid lang attribute</span>

Ensures lang attributes have valid values

lang attribute must have a valid value

        <video width="320" height="240" controls>
    <source src="https://www.quirksmode.org/html5/videos/big_buck_bunny.mp4" type="video/mp4">
    <track kind="descriptions">
</video>

Ensures <video> elements have captions

<video> elements must have captions

        <video width="320" height="240" controls>
    <source src="https://www.quirksmode.org/html5/videos/big_buck_bunny.mp4" type="video/mp4">
    <track kind="captions">
</video>

Ensures <video> elements have audio descriptions

<video> elements must have an audio description track

accesskeys

Markup:

Description:

Help:

area-alt

Markup:

Description:

Help:

aria-allowed-attr

Markup:

Description:

Help:

aria-allowed-role

Markup:

Description:

Help:

aria-dpub-role-fallback

Markup:

Description:

Help:

aria-hidden-body

Markup:

Description:

Help:

aria-required-attr

Markup:

Description:

Help:

aria-required-children

Markup:

Description:

Help:

aria-required-parent

Markup:

Description:

Help:

aria-roles

Markup:

Description:

Help:

aria-valid-attr-value

Markup:

Description:

Help:

aria-valid-attr

Markup:

Description:

Help:

audio-caption

Markup:

Description:

Help:

autofill

Markup:

Description:

Help:

blink

Markup:

Description:

Help:

button-name

Markup:

Description:

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bypass

Markup:

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checkboxgroup

Markup:

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color-contrast

Text with low contrast

Markup:

Description:

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definition-list

Markup:

Description: