Clarify paints outside viewport #59
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FP and FCP must consider contents that are painted outside of the viewport. This is only relevant in odd edge cases and is done for simplicity and performance. Fixes #58
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I wouldn't qualify them as "odd edge cases". Painting outside the viewport is very common. |
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It is an 'odd edge case' to ONLY paint outside the viewport. |
rniwa
reviewed
Mar 5, 2020
| <dfn export>First Contentful Paint</dfn> entry contains a {{DOMHighResTimeStamp}} reporting the time when the browser first rendered any text, image (including background images), non-white canvas or SVG. This excludes any content of iframes, but includes text with pending webfonts. This is the first time users could start consuming page content. | ||
| <dfn export>First Contentful Paint</dfn> entry contains a {{DOMHighResTimeStamp}} reporting the time when the user agent first rendered any text, image (including background images), non-white canvas or SVG. This excludes any content of iframes, but includes text with pending webfonts. This is the first time users could start consuming page content. | ||
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| Whenever a user agent preemptively paints content outside of the viewport, those paints MUST be considered for <a>First Paint</a> and <a>First Contentful Paint</a>. |
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FP and FCP must consider contents that are painted outside of the viewport. This is only relevant in odd edge cases and is done for simplicity and performance. Fixes #58
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