--- title: "Accessibility Checker plugin" description: "Checks the contents of the editor for WCAG & Section 508 accessibility problems." canonical_url: "https://www.tiny.cloud/docs/tinymce/latest/a11ychecker/" md_url: "https://www.tiny.cloud/docs/tinymce/7/a11ychecker/index.md" version: "7" last_updated: "2026-06-15T05:48:07Z" tokens: 6956 --- Important This page documents TinyMCE 7. For new projects, Tiny recommends using the latest, most up-to-date version. [See TinyMCE 8 documentation](../../latest/a11ychecker/). # Accessibility Checker plugin > **Note:** This plugin is only available for [paid TinyMCE subscriptions](/pricing/). The `a11ychecker` premium plugin allows you to check the HTML in the editor for various WCAG & Section 508 accessibility problems. It has an auto-repair feature that lets the user fix identified problems. ## Interactive example **Example** ```js tinymce.init({ selector: 'textarea#a11ychecker', plugins: 'a11ychecker advcode table advlist lists image media anchor link autoresize', toolbar: 'a11ycheck | blocks bold forecolor backcolor | bullist numlist | link image media anchor | table | code', a11y_advanced_options: true, a11ychecker_html_version: 'html5', a11ychecker_level: 'aaa', content_style: 'body { font-family:Helvetica,Arial,sans-serif; font-size:16px }' }); ``` ## Basic setup To add the Accessibility Checker plugin to the editor, add `a11ychecker` to the `plugins` option in the editor configuration. For example: ```js tinymce.init({ selector: 'textarea', plugins: 'a11ychecker', toolbar: 'a11ycheck' }); ``` ## Accessibility Rules The following checks are available for the Accessibility Checker plugin. The rules checked depends on: - The level of compliance (A, AA, or AAA), set using the `a11ychecker_level` option. - The HTML version of the content, set using the `a11ychecker_html_version` option. Each rule has a severity level, which will be one of the following, listed in order of increasing severity: - Warning - Error ### D1 - Usage of paragraphs as headings **Rule description:** this rule checks that `h1` - `h6` tags are used for heading content, not `p` tags. Not using correct heading markup will make it difficult for assistive technologies to represent and navigate through your content. #### Accessibility Checker rule details - D1 Notification level (severity) Warning [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specifications - [H42 - Using h1-h6 to identify headings](https://www.w3.org/WAI/WCAG21/Techniques/html/H42.html). - [H69 - Providing heading elements at the beginning of each section of content](https://www.w3.org/WAI/WCAG21/Techniques/html/H69.html). ### D2 - Sequential headings **Rule description:** this rule checks that headings tags are used sequentially. For example: A `h1` heading should be followed by a `h2` heading, not a `h3` heading. Using sequential headings will make it easier for assistive technology to parse your content. #### Accessibility Checker rule details - D2 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G141 - Organizing a page using headings](https://www.w3.org/WAI/WCAG21/Techniques/general/G141.html). ### D3 - Adjacent links **Rule description:** this rule checks that links next to other links do not have the same `href` attribute. For example: If an image link and a text link have the same `href` attribute, both elements should be in the same `a` element. If an image link and a text link point to the same URL but are two separate elements, it can be confusing for users of screen readers and other assistive technologies. #### Accessibility Checker rule details - D3 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H2 - Combining adjacent image and text links for the same resource](https://www.w3.org/WAI/WCAG21/Techniques/html/H2.html). ### D4O - Ordered list structure **Rule description:** this rule checks that an `ol` element is used for ordered lists. Do not use paragraphs beginning with numbers or roman numerals instead of an `ol` element containing `li` items. This is to simplify navigation and parsing of the content for users of assistive technologies. #### Accessibility Checker rule details - D4O Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H48 - Using ol, ul and dl for lists or groups of links](https://www.w3.org/WAI/WCAG21/Techniques/html/H48.html). ### D4U - Unordered list structure **Rule description:** this rule checks that a `ul` element is used for unordered lists. Do not use paragraphs beginning with `*` or `-` or some similar character instead of an `ol` element containing `li` items. This is to simplify navigation and parsing of the content for users of assistive technologies. #### Accessibility Checker rule details - D4U Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H48 - Using ol, ul and dl for lists or groups of links](https://www.w3.org/WAI/WCAG21/Techniques/html/H48.html). ### D5 - Contrast ratio of the text (D5A, D5B, and D5C) **Rule description:** this rule checks that the contrast ratio of the text is above the following values: - When the compliance level is set to AA, - 4.5:1 for normal text - 3:1 for large text - When the compliance level is set to AAA, - 7:1 for any text Text with a low contrast ratio is hard to read for users with impaired vision. #### Accessibility Checker rule details - D5A Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level AA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G145 - Ensuring that a contrast ratio of at least 3:1 exists between text (and images of text) and background behind the text](https://www.w3.org/WAI/WCAG21/Techniques/general/G145.html). #### Accessibility Checker rule details - D5B Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level AA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G18 - Ensuring that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text](https://www.w3.org/WAI/WCAG21/Techniques/general/G18.html). #### Accessibility Checker rule details - D5C Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G17 - Ensuring that a contrast ratio of at least 7:1 exists between text (and images of text) and background behind the text](https://www.w3.org/WAI/WCAG21/Techniques/general/G17.html). ### H93 - IDs must be unique **Rule description:** this rule checks that all `id` attributes are unique in the editor. Duplicate `id` attributes are known to cause problems for assistive technologies when parsing the content. #### Accessibility Checker rule details - H93 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H93 - Ensuring that id attributes are unique on a Web page](https://www.w3.org/WAI/WCAG21/Techniques/html/H93.html). ### I1 - Image `alt` text **Rule description:** this rule checks that all images have alternative (`alt`) text for screen readers and other assistive technologies. #### Accessibility Checker rule details - I1 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G95 - Providing short text alternatives that provide a brief description of the non-text content](https://www.w3.org/WAI/WCAG21/Techniques/general/G95.html). > **Note:** In TinyMCE 6.3 and later, rule [I3](#I3) can also be applied. If applied, an *Image alternative text should be less than 100 characters* warning dialog presents if the alternative (`alt`) text is longer than 100 characters. This dialog also presents the alternative text in an editable field, for immediate repair. ### I2 - Image `alt` text is not the image filename **Rule description:** this rule checks that the `alt` attribute text of the image is not the same as the filename of the image. #### Accessibility Checker rule details - I2 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [G95 - Providing short text alternatives that provide a brief description of the non-text content](https://www.w3.org/WAI/WCAG21/Techniques/general/G95.html). > **Note:** In TinyMCE 6.3 and later, rule [I3](#I3) can also be applied. If applied, an *Image alternative text should be less than 100 characters* warning dialog presents if the alternative (`alt`) text is longer than 100 characters. This dialog also presents the alternative text in an editable field, for immediate repair. ### I3 - Image `alt` text is not greater than 100 characters **Rule description:** this rule checks that the `alt` attribute text of the image is not more than 100 characters. An *Image alternative text should be less than 100 characters* warning dialog presents if the alternative (`alt`) text is longer than 100 characters. This dialog also presents the alternative text in an editable field, for immediate repair. #### Accessibility Checker rule details - I3 Notification level (severity) Warning [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification n/a. > **Note:** This feature is only available for TinyMCE 6.3 and later. ### T1 - Table caption **Rule description:** this rule checks that all `table` elements have a `caption` element describing the data inside the table to simplify parsing and navigation of the content for users of assistive technologies. #### Accessibility Checker rule details - T1 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H39 - Using caption elements to associate data table captions with data tables](https://www.w3.org/WAI/WCAG21/Techniques/html/H39.html). ### T2 - Complex table summary **Rule description:** this rule checks that all complex tables must have a `summary` attribute explaining to users of assistive technologies how to navigate through the data inside of the table. > **Note:** This rule only applies to HTML 4 content and is not checked when `a11ychecker_html_version` is set to `html5`. #### Accessibility Checker rule details - T2 Notification level (severity) Warning [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 WCAG 2.1 specification [H73 - Using the summary attribute of the table element to give an overview of data tables](https://www.w3.org/WAI/WCAG21/Techniques/html/H73.html). ### T3 - Table caption and summary **Rule description:** this rule checks that the table caption and summary does not have the same text content. The caption should explain **what** the table is about while the summary should explain **how** to navigate the data inside of the table. > **Note:** The table `summary` attribute was deprecated in HTML 5, both the **what** and **how** information should be moved to the table caption. #### Accessibility Checker rule details - T3 Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H73 - Using the summary attribute of the table element to give an overview of data tables](https://www.w3.org/WAI/WCAG21/Techniques/html/H73.html). ### T4A - Table markup **Rule description:** this rule checks that all `tables` contain both `tr` and `td` elements. #### Accessibility Checker rule details - T4A Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H51 - Using table markup to present tabular information](https://www.w3.org/WAI/WCAG21/Techniques/html/H51.html). ### T4B - Table headers **Rule description:** this rule checks that all `table` elements contain at least one table header (`th`) element. #### Accessibility Checker rule details - T4B Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H51 - Using table markup to present tabular information](https://www.w3.org/WAI/WCAG21/Techniques/html/H51.html). ### T4C - Table heading scope **Rule description:** this rule checks that all table header (`th`) elements have a `scope` attribute clarifying what scope the heading has inside of the `table`. The allowed values are `row`, `col`, `rowgroup`, and `colgroup`. This is important for users of assistive technologies to be able to parse table data. #### Accessibility Checker rule details - T4C Notification level (severity) Error [WCAG level](https://www.w3.org/TR/WCAG21/#conformance) Level A ; Level AA ; Level AAA [HTML version](#a11ychecker_html_version) HTML4 and HTML5 WCAG 2.1 specification [H63 - Using the scope attribute to associate header cells and data cells in data tables](https://www.w3.org/WAI/WCAG21/Techniques/html/H63.html). ## Options The following configuration options affect the behavior of the Accessibility Checker plugin. ### `a11y_advanced_options` This option affects the functionality of: - The [Accessibility Checker](#) plugin (`a11ychecker`). - The [Image](../image/) plugin (`image`). - The [Image Optimizer Powered by Uploadcare](../uploadcare/) plugin (`uploadcare`). Setting `a11y_advanced_options` to `true`: - Adds the **Image is decorative** option to the *Insert/Edit Image* dialog, allowing users to specify that an image is decorative and does not require alternative text for accessibility purposes. - Adds the **Decorative image** button to Image Optimizer’s *Alt text* context toolbar, allowing users to specify that an image is decorative and does not require alternative text for accessibility purposes. - Adds the **Image is decorative** option to the *Accessibility Checker error* dialog for images without alternative text or the `role="presentation"` attribute. > **Important:** If `a11ychecker_allow_decorative_images` is not explicitly set, the value defined in `a11y_advanced_options` will be used. **Type:** `Boolean` **Default value:** `false` **Possible values:** `true`, `false` #### Example: using `a11y_advanced_options` ```js tinymce.init({ selector: 'textarea', // change this value according to your HTML plugins: 'a11ychecker', toolbar: 'a11ycheck', a11y_advanced_options: true, }); ``` ### `a11ychecker_allow_decorative_images` This option sets whether the Accessibility Checker should allow decorative images. When this option is set to `true`, a decorative image must have **both**: - An empty alternative text attribute. - The `role="presentation"` attribute. For example: ```html ``` If `a11ychecker_allow_decorative_images` is set to `true`, the Accessibility Checker will present an error when: - An image does not have the alternative text attribute (`alt`). - An image has an empty alternative text attribute, but is missing the `role="presentation"` attribute. - An image has alternative text and a conflicting `role="presentation"` attribute. If `a11ychecker_allow_decorative_images` is set to `false`, the Accessibility Checker will present an error when: - An image does not have the alternative text attribute (`alt`). - An image has an empty alternative text attribute. - An image has the `role="presentation"` attribute. > **Note:** If `a11ychecker_allow_decorative_images` is not explicitly set, the value defined in `a11y_advanced_options` will be used. **Type:** `Boolean` **Default value:** `false` **Possible values:** `true`, `false` #### Example: using `a11ychecker_allow_decorative_images` ```js tinymce.init({ selector: 'textarea', plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_allow_decorative_images: true }); ``` ### `a11ychecker_filter_issue` The `a11ychecker_filter_issue` option allows Accessibility Checker issues to be removed from the Accessibility Checker report using a callback function. This option is a flexible alternative to the `a11ychecker_ignored_rules` option. This option can remove issues from the results shown in the dialog and the `getReport` API. The callback function will be passed [`issue` objects](#issue) generated by the [`getReport()` API](#getreport). To remove an issue from the Accessibility Checker report the callback needs to return `false` for that particular issue. **Type:** `Function` **Default value:** ```js (issue) => true; ``` #### Example: using `a11ychecker_filter_issue` to filter out the Accessibility Checker T1 rule The callback function in the following example will return `false` if the issue `id` value is `'T1'`, filtering `'T1'` issues from the Accessibility Checker report. ```js tinymce.init({ selector: 'textarea', // change this value according to your html plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_filter_issue: (issue) => { return issue.id !== 'T1'; } }); ``` #### Example: using `a11ychecker_filter_issue` to filter out all Accessibility Checker table rules and rules less than `'error'` level The callback function in the following example will only return `false` if the issue `element` is a `'table'` and the `'severity'` level is not `'error'`, filtering all low-severity and `table` element-related issues from the Accessibility Checker report. ```js tinymce.init({ selector: 'textarea', // change this value according to your html plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_filter_issue: (issue) => { return !(issue.element.nodeName.toLowerCase() === 'table' || issue.severity !== 'error'); } }); ``` #### Example: using `a11ychecker_filter_issue` to filter images with empty alternative text from the Accessibility Checker I1 rule The callback function in the following example will only return `false` for any issues with `'I1'` as the `'id'` image elements with an empty `+'alt+'` attribute, otherwise the issue won’t be filtered out. This implementation can be useful as allowing images to have empty alternative text can be another method of applying the `role="presentation"` attribute to mark an image as `decorative`. ```js tinymce.init({ selector: 'textarea', // change this value according to your html plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_filter_issue: (issue) => { const element = issue.element; const isImageAndI1Issue = issue.id === 'I1' && element.nodeName.toLowerCase() === 'img'; const hasEmptyAltAttribute = element.hasAttribute('alt') && element.alt === ''; return !(isImageAndI1Issue && hasEmptyAltAttribute); } }); ``` ### `a11ychecker_html_version` This configuration option sets the HTML version to use when checking issues. For example: Setting the version to HTML 4 will enable the rule "Complex tables should have summaries", where `summary` is a valid attribute in HTML 4 but not HTML 5. **Type:** `String` **Default value:** `html5` **Possible values:** `html4`, `html5` #### Example: using `a11ychecker_html_version` ```js tinymce.init({ selector: 'textarea', plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_html_version: 'html4' }); ``` ### `a11ychecker_ignored_rules` The `a11ychecker_ignored_rules` option prevents specific Accessibility Checker rules from being checked. This feature allows developers to skip rules that they do not wish to check. For example: To skip rules that flag known content issues or custom HTML that should not be checked. **Type:** A comma-separated string. **Default value:** `''` **Possible values:** `'D1'`, `'D2'`, `'D3'`, `'D4O'`, `'D4U'`, `'D5A'`, `'D5B'`, `'D5C'`, `'H93'`, `'I1'`, `'I2'`, `'T1'`, `'T2'`, `'T3'`, `'T4A'`, `'T4B'`, `'T4C'` #### Example: using `a11ychecker_ignored_rules` This examples shows how to ignore the following checks (rules): - D2 - Sequential headings - I2 - Image `alt` text is not the image filename - T4B - Table headers ```js tinymce.init({ selector: 'textarea', // change this value according to your html plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_ignored_rules: 'D2, I2, T4B' }); ``` ### `a11ychecker_issue_url_callback` The `a11ychecker_issue_url_callback` option is used to change the target URL for the "Click for more info" button ( ![help icon - a question mark inside a circle](../_images/icons/help.svg) ) in the Accessibility Checker dialog. By default, the "more info" links will point to `https://www.tiny.cloud/docs/tinymce/7/a11ychecker/#`, such as `https://www.tiny.cloud/docs/tinymce/7/a11ychecker/#D1`. This option can be used to set the target URL to a page or pages outside [https://www.tiny.cloud/docs/](/docs/). **Type:** `Function` **Default value:** ```js (ruleId) => `https://www.tiny.cloud/docs/tinymce/6/a11ychecker/#${ruleId}` ``` #### Example: using `a11ychecker_issue_url_callback` This example shows how to change the link for the "Click for more info" button ( ![help icon - a question mark inside a circle](../_images/icons/help.svg) ) on the Accessibility Checker dialog to point to anchors at `www.example.com/tinymce/a11ychecker/more_info`. ```js tinymce.init({ selector: 'textarea', // change this value according to your html plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_issue_url_callback: (ruleId) => `https://www.example.com/tinymce/a11ychecker/more_info#${ruleId}` }); ``` ### `a11ychecker_level` This configuration option sets the [WCAG level](https://www.w3.org/TR/WCAG20/#conformance) to use when checking issues. For example, the "Text must have a contrast ratio of at least …​" rule: - When using **AA**, Accessibility Checker will check that the contrast ratio is not less than 4.5:1. - When using **AAA**, Accessibility Checker will check that the contrast ratio is not less than 7.0:1. **Type:** `String` **Default value:** `aa` **Possible values:** `a`, `aa`, `aaa` #### Example: using `a11ychecker_level` ```js tinymce.init({ selector: 'textarea', plugins: 'a11ychecker', toolbar: 'a11ycheck', a11ychecker_level: 'aaa' }); ``` ## Toolbar buttons The Accessibility Checker plugin provides the following toolbar buttons: | Toolbar button identifier | Description | | --- | --- | | `a11ycheck` | Opens the accessibility checker dialog. | These toolbar buttons can be added to the editor using: - The [`toolbar`](../toolbar-configuration-options/#toolbar) configuration option. - The [`quickbars_insert_toolbar`](../quickbars/#quickbars_insert_toolbar) configuration option. - [Custom Context toolbars](../contexttoolbar/). ## Menu items The Accessibility Checker plugin provides the following menu items: | Menu item identifier | [Default Menu Location](../menus-configuration-options/#example-the-tinymce-default-menu-items) | Description | | --- | --- | --- | | `a11ycheck` | Tools | Opens the accessibility checker dialog. | These menu items can be added to the editor using: - The [`menu`](../menus-configuration-options/#menu) configuration option. - The [`contextmenu`](../menus-configuration-options/#contextmenu) configuration option. - [Custom Menu toolbar buttons](../custom-menu-toolbar-button/). ## Events The Accessibility Checker plugin provides the following events. | Name | Data | Description | | --- | --- | --- | | A11ycheckStart | N/A | Fired when the Accessibility Checker is `opened` | | A11ycheckStop | N/A | Fired when the Accessibility Checker is `closed` | | A11ycheckIgnore | N/A | Fired when the `Ignore` button is pressed | | A11ycheckRepair | N/A | Fired when the `Repair` button is pressed | | A11ycheckShowDetails | N/A | Fired when the `Click for more info` button is pressed | ## APIs The Accessibility Checker plugin provides the following APIs. ### `toggleaudit()` Opens and closes the accessibility checker dialog with the results of the audit and options to correct the problems, if any. #### Example: using `toggleaudit()` ```js tinymce.activeEditor.plugins.a11ychecker.toggleaudit(); ``` ### `getReport()` Conducts an accessibility audit and reports the results without opening the dialog. The report produced is an array of objects, where each object represents an [issue](#issue). #### Example: using `getReport()` ```js const issues = tinymce.activeEditor.plugins.a11ychecker.getReport(); console.log(issues); // Example result [ { "contentID": "
Text: \"H5\"
", "description": "Headings must be applied in sequential order. For example: Heading 1 should be followed by Heading 2, not Heading 3.", "element": h5, // reference to the DOM element where the issue was found "id": "D2", "severity": "error", "url": "https://www.w3.org/WAI/WCAG21/Techniques/general/G141.html", }, { "contentID": "
Table: \"2x2\"
", "description": "Tables must have captions", "element": table, // reference to the DOM element where the issue was found "id": "T1", "severity": "error", "url": "https://www.w3.org/WAI/WCAG21/Techniques/html/H39.html", } ] ``` ### The `issue` object In a11ychecker, when the content within the editor is `audited`, each element is checked to ensure that no [Accessibility rules](#accessibility-rules) are violated. Any element which doesn’t adhere to a rule will generate an `issue` within the audit; the details of which are to be displayed in the a11ychecker dialog. The `'issue'` object provides relevant data pertaining to any issue generated by an element which violates an [Accessibility rule](#accessibility-rules): - `id`: `String` A11ychecker issue identifier used by TinyMCE, such as D1, T4A. For a description and other details about the issue, see [Accessibility Rules](#accessibility-rules). - `description`: `String` description of the issue; as will be displayed in the dialog. - `severity`: `String` severity level of the issue; either `warning` or `error`. - `url`: `String` URL reference for the issue. By default, this will be a link to the W3 website, containing the W3 WCAG technique that needs to be addressed to clear the issue. - `element`: `Object` DOM element where the issue was found. - `contentID`: `String` A short snippet of the content (such as text, link, image, or table) where the issue was found.