[Webkit-unassigned] [Bug 174892] When animating in a sidebar via shrinking flex items, <input> with autofocus, the page scrolls sideways

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174892

--- Comment #5 from Bob Lail <bob.lail at cph.org> ---
(In reply to Simon Fraser (smfr) from comment #3)
> Chrome shows this same behavior. Firefox is similar; it pins the document to
> the left side, but the document width is still changing as the sidebar comes
> in.
> 
> This is a weird way to animate in the sidebar, because the document width is
> changing (look at the scrollbars).

Yeah, I noticed the scrollbars and thought at first that setting `max-width` on something would circumvent the problem; but part of strangeness here is that the widths of `#surfaces`, `body`, and `html` *aren't* changing. If you modify the step function in my example to output those values, you'll see what I mean.

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