Not TestedTesting not done, may not work properly
Performance

Paint Timing API

Measure First Paint (FP) and First Contentful Paint (FCP) metrics.

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Interactive Input Workspace

Ready for input

Web API Execution Output

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Native JavaScript Code Example (Zero Libraries)

const paints = performance.getEntriesByType('paint');
paints.forEach(p => console.log(p.name, p.startTime));

About the Paint Timing API Web API

Paint Timing API reports First Paint and First Contentful Paint timestamps.

Specification:W3C & WHATWG Web API Standard
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