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First Paint (FP) - Glossary | MDN
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First Paint (FP)
First Paint is the time between navigation and when the browser first renders pixels to the screen, rendering anything that is visually different from the default background color of the body. It is the first key moment in page load and will answer the question "Has the browser started to render the page?"
See also
PerformancePaintTiming- Related glossary terms: