[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [RuleUsage](./puppeteer.protocol.css.ruleusage.md) > [used](./puppeteer.protocol.css.ruleusage.used.md) ## Protocol.CSS.RuleUsage.used property Indicates whether the rule was actually used by some element in the page. Signature: ```typescript used: boolean; ```