13. Additional rules for compliance

Some guidelines found in accessibility reference documents were not included in this manual as they are considered as rarely applicable or non-compliant.

It is however necessary to respect these additional rules to ensure compliance with RGAA 4.1.2 and WCAG 2.1.

They are listed below:

• Ensure content readability even when the font size is increased up to 200%
• Incorporate the summary of each complex data table in the <caption> tag
• Provide alternative text for each informative <canvas>, <embed> and <object> tag
• Provide alternative text for each <canvas>, <embed> and <object> tag used as a link or button
• Hide each decorative or ambient <canvas>, <embed> and <object> tag from assistive technologies
• Do not initiate an action while the trigger is in the “pressed” state
• Use <button> and <a> to perform actions that change focus or cause page changes.
• Group related options in <select> boxes with <optgroup>
• Add the title attribute to describe each <frame>
• Use the dir attribute to indicate a change in reading direction
• Ensure proper use of content masking techniques

• Do not use tags or attributes specific to data tables in layout tables
• Ensure that the HTML flow is consistent from one page to the next
• Indicate in the alternative text for visual CAPTCHA where to find the non-visual version
• Make sure layout tables follow the right reading order
• Plan alternative text for each type of multimedia content (<video>, <audio>, <object>, <embed>, etc.)
• Populate the alt attribute of each mapped image and its <area /> tags
• Tag block quotations using <blockquote>
• Tag inline quotations using <q>
• Write the HTML code in a logical reading order

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