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Text that acts as a heading visually or structurally SHOULD be designated as a true heading in the markup.
Text that does not act as a heading visually or structurally SHOULD NOT be marked as a heading.
Heading text SHOULD be concise and relatively brief.
Headings SHOULD convey a clear and accurate structural outline of the sections of content of a web page.
Headings SHOULD NOT skip hierarchical levels.
The beginning of the main content SHOULD start with <h1>.
Most web pages SHOULD have only one <h1>.
Links
Required
- Links MUST be visually distinguishable from surrounding text.
- Color alone must not be used to distinguish links from surrounding text unless the color contrast between the link and the surrounding text is at least 3:1 and an additional differentiation is provided when the link is hovered or receives focus.
- Links MUST be semantically designated as such.
- A link MUST have programmatically-discernible text, as determined by the accessible name calculation algorithm.
- Features such as labels, names, and text alternatives for content that have the same functionality across multiple web pages MUST be consistently identified.
- All focusable elements MUST have a visual focus indicator when in focus.
Non-required / best practice
- Links and buttons SHOULD be designated semantically according to their functions.
- The purpose of each link SHOULD be able to be determined from the link text alone.
- The link text SHOULD NOT repeat the role ("link").
- A link that opens in a new window or tab SHOULD indicate that it opens in a new window or tab.
- A link to a file or destination in an alternative or non-web format SHOULD indicate the file or destination type.
- Focusable elements SHOULD have enhanced visual focus indicator styles.
Lists
Required
Non-required / best practice
Tables
Required
Non-required / best practice
iFrames
Required
Non-required / best practice