[Home](./index.md) > [puppeteer](./puppeteer.md) > [Coverage](./puppeteer.coverage.md) > [startCSSCoverage](./puppeteer.coverage.startcsscoverage.md) ## Coverage.startCSSCoverage() method Signature: ```typescript startCSSCoverage(options?: CSSCoverageOptions): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | [CSSCoverageOptions](./puppeteer.csscoverageoptions.md) | defaults to { resetOnNavigation : true } | Returns: Promise<void> Promise that resolves when coverage is started.