[Webkit-unassigned] [Bug 27160] Implement vw/vh/vm (viewport sizes) from CSS 3 Values and Units

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=27160





--- Comment #19 from Luke Macpherson <macpherson at chromium.org>  2012-01-30 17:02:01 PST ---
(In reply to comment #15)
> (In reply to comment #14)
> > What happens when the window is resized? It seems like we need to re-calculate all lengths that have already been computed, which in effect means re-applying all CSS properties continuously during a window resize (ie. for every new width which the window size is changing). That seems like it would be really computationally expensive.
> 
> It's basically identical to using a lot of percentages, except it can potentially apply more widely.

That isn't true if you look at the implementation in the patch. Normally percentage lengths are not converted to pixel lengths while applying the CSS values to RenderStyle as they are here. Instead there is a special kind of LengthType for percentages. I think you'd need to add another length type similar to percent for viewport-relative lengths to make this work efficiently.

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