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Define whether clipped contents should be included in first contextual paint #20

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rniwa opened this Issue Nov 6, 2017 · 1 comment

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rniwa commented Nov 6, 2017

First contextual paint says

non-white canvas or SVG

But verifying that canvas doesn't contain any non-initial pixel or non-clipped text in SVG is expensive. We should re-define in such a way that UA can cheaply determine this by, e.g. not worrying about clipping.

@igrigorik igrigorik added this to the Level 1 milestone May 25, 2018

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tdresser commented Oct 25, 2018

Non-white canvas -> Canvas that has not been drawn to.
Ryosuke proposes just firing for empty SVG's. They should be rare anyways.

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