Add auto sizes fallback img doc #40906
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AyaanB24
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estelle
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chrisdavidmills
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@AyaanB24 thanks for another great contribution! I've got a few comments for you to consider.
Josh-Cena
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Aug 27, 2025
…AyaanB24/content into add-auto-sizes-fallback-img-doc qa!
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Awesome, this is looking good. Thanks again @AyaanB24!
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Fixes #40902
Summary
Added clarification for the auto keyword and fallback values in the sizes attribute of the![]()
element. This ensures developers know how to maintain backward compatibility for browsers that do not support auto.
Problem
The existing MDN documentation did not mention:
How to specify fallback values when using auto.
The importance of ordering fallback values for older browsers.
What Changed
Updated the sizes attribute description.
Added note about backward compatibility.
Included an example from the HTML specification.
Before
After