[Webkit-unassigned] [Bug 159635] em-based media queries in <source> are relative to <html> instead of browser default font

Tue Feb 7 14:10:58 PST 2017

https://bugs.webkit.org/show_bug.cgi?id=159635

Myles C. Maxfield <mmaxfield at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Myles C. Maxfield <mmaxfield at apple.com> ---
The spec says[1] "Other units must be interpreted the same as in Media Queries." The Media Queries spec says[2] "Relative units in media queries are based on the initial value, which means that units are never based on results of declarations. For example, in HTML, the â€˜emâ€™ unit is relative to the initial value of â€˜font-sizeâ€™."

Therefore, we are following the spec.

[1] http://w3c.github.io/html/semantics-embedded-content.html#element-attrdef-img-srcset
[2] https://www.w3.org/TR/css3-mediaqueries/#units

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