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"Image elements have explicit `width` and `height`" audit ok even with percentage values
See original GitHub issueFAQ
- Yes, my issue is not about variability or throttling.
- Yes, my issue is not about a specific accessibility audit (file with axe-core instead).
URL
What happened?
With this HTML (from linked jsbin):
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<img src="https://via.placeholder.com/300x200" width="300" height="200">
<img src="https://via.placeholder.com/300x200">
<img src="https://via.placeholder.com/300x200" width="100%" height="200">
</body>
</html>
Only the second image is reported as missing “explicit width and height”:
Per MDN, The intrinsic width of the image in pixels. Must be an integer without a unit.
width="100%" is however accepted by browsers, they seem to use it as if it was img { width: 100%; } in CSS.
What did you expect?
I would have expected Lighthouse to report width="100%" as not being an “explicit width”.
What have you tried?
No response
How were you running Lighthouse?
Chrome DevTools
Lighthouse Version
9.6.2
Chrome Version
105.0.5195.125 (Build officiel) (x86_64)
Node Version
No response
OS
macOS
Relevant log output
No response
Issue Analytics
- State:
- Created a year ago
- Reactions:1
- Comments:9 (4 by maintainers)
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re: % in html width, it seems like a good idea to suggestion this become a deprecation console message. I’d suggest filing this somewhere under the DevTools component on crbug.com https://bugs.chromium.org/p/chromium/issues/list
I don’t think it makes much sense. It is technically possible to use
%and display the image with the correct aspect ratio. For example: