Sticky mobile action bars: Crawl Audit check 135

Short answer: a small bar fixed to the bottom of a phone screen, with "Call", "Book" or "Buy", keeps the main action in reach while people read. Check 135 is informational and always passes: it notes whether the page seems to have one.

What Crawl Audit checks

• Pass: the HTML contains position: sticky or position: fixed, and the page has a call to action (check 111).
• Pass: otherwise, with a note that it's optional.

It can't tell a sticky action bar from any other sticky element, such as a header.

What to watch

• Hiding focused content. WCAG 2.4.11 Focus Not Obscured (level AA) says a focused item must not be entirely hidden by author content. The W3C names "sticky footers, sticky headers, and non-modal dialogs" as typical causes, and lists a sticky footer or header hiding focused elements as a known failure.
• Screen space. Together with a sticky header (check 107), it can leave little room for content on a small phone.
• Covering other things: the cookie banner, chat bubble or the last line of the page.

Doing it well

• One or two actions, short labels, and big enough to tap (check 104).
• Add bottom padding to the page, so the bar never covers the end of the content.
• Show it only on phones, and consider showing it after the first screen.

Sources

• W3C, Understanding 2.4.11 Focus Not Obscured (Minimum) (updated 15 June 2026), checked 6 October 2026.