Browsers seem to make fixed-position elements form containing blocks for fixed-position descendants, not the viewport. Seems wrong.
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Replying to @meyerweb
@meyerweb Are top/left:auto involved? Or transforms, which act as a containing block for fixed pos (see dev.w3.org/csswg/css3-2d-tra… )

Sep 8, 2011 · 5:06 AM UTC