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[css-values] Value of rem when document have no root element #936

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upsuper opened this issue Jan 16, 2017 · 1 comment
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[css-values] Value of rem when document have no root element #936

upsuper opened this issue Jan 16, 2017 · 1 comment
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css-values-3

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@upsuper
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upsuper commented Jan 16, 2017

It is not specced that what should happen when there is no root element in a document, and one tries to compute value of rem unit.

For example given the following code:

<!DOCTYPE html>
<iframe src="about:blank"></iframe>
<script>
  window.onload = function() {
    var win = document.querySelector('iframe').contentWindow;
    var doc = document.querySelector('iframe').contentDocument;
    var b = doc.body;
    doc.documentElement.style.fontSize = '24px';
    b.style.lineHeight = '2rem';
    doc.removeChild(doc.documentElement);
    alert('line-height: ' + win.getComputedStyle(b).lineHeight);
  };
</script>

Gecko and Edge shows 48px, and Blink shows empty.
@tabatkins
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Fixed now - we folded the root-finding into the same bit as the parent-finding (for 'em' in 'font-size'), and so if there is no root, it ends up looking at the initial values.

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@upsuper @tabatkins