cvrebert has just created a new issue for https://github.com/w3c/csswg-drafts: == [css-values] Font-relative length definitions don't account for media query usage == (All emphases added) > [...] the [font-relative lengths](https://drafts.csswg.org/css-values/#font-relative-lengths) refer to the font metrics of the **element on which they are used**. > [...] > <dl><dt><a href="https://drafts.csswg.org/css-values/#em">em unit</a></dt> > <dd>Equal to the computed value of the 'font-size' property of the <b>element on which it is used</b>.</dd></dl> When using such font-relative lengths in a media query expression: * The author isn't "using" the length "on" something, per se. * In the most common case, the author is using the length in relation to the viewport, which isn't an *element*. > <dl><dt><a href="https://drafts.csswg.org/css-values/#rem">rem unit<a></dt> > <dd>Equal to the <b>computed value</b> of font-size on the root element. When specified on the 'font-size' property [...]</dd></dl> Media queries interpret `rem` differently; see https://drafts.csswg.org/mediaqueries/#units The other font-relative unit definitions likewise don't seem to account for usage in media query expressions. Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/153 using your GitHub accountReceived on Sunday, 29 May 2016 05:01:11 UTC
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