Multimedia Fallback
ID |
html.multimedia_fallback |
Severity |
low |
Remediation Complexity |
low |
Remediation Risk |
low |
Remediation Effort |
low |
Resource |
Reliability |
Language |
Html |
Tags |
reliability |
Description
Flags a <video> or <audio> element that provides neither a media source nor any fallback
content.
Rationale
A media element supplies its source either through a src attribute or through nested <source>
children, and it should also hold fallback text for browsers that cannot play the media. An element
with none of these renders an empty box and tells the user nothing.
<video></video> <!-- FLAW — no source, no fallback -->
<video src="m.mp4"></video> <!-- OK — src attribute -->
<video><source src="m.mp4"></video> <!-- OK — nested source -->
<video>Your browser does not support video</video> <!-- OK — fallback text -->Remediation
Provide the media via a src attribute or one or more nested <source> elements, and include
fallback text inside the element for user agents that cannot play it.