CSS rule coverage example
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'use strict'; | |
launchChrome() | |
.then(async chrome => { | |
const cdp = await CDP({port: chrome.port}); | |
try { | |
const {CSS, DOM, Page, Profiler} = cdp; | |
setupDevToolsTarget(cdp); | |
await Page.enable(); | |
await DOM.enable(); | |
await CSS.enable(); | |
CSS.startRuleUsageTracking(); | |
Page.navigate({url: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy'}); | |
await Page.loadEventFired(); | |
const cssCoverageResults = await CSS.stopRuleUsageTracking(); | |
cssCoverageResults.ruleUsage.sort((a, b) => a.startOffset - b.startOffset); | |
const cssRule = cssCoverageResults.ruleUsage[0]; | |
// cssRule === { endOffset: 566, startOffset: 17, styleSheetId: "6375.2", used: true } | |
const cssFile = await CSS.getStyleSheetText({styleSheetId: cssRule.styleSheetId}); | |
const usedCssSelector = cssFile.text.substring(cssRule.startOffset, cssRule.endOffset); | |
/* usedCssSelector === | |
`#toc a, | |
.external-icon:not([href^='https://mdn.mozillademos.org']):not(.ignore-external):focus:after, | |
.external-icon:not([href^='https://mdn.mozillademos.org']):not(.ignore-external):focus:before, | |
.external-icon:not([href^='https://mdn.mozillademos.org']):not(.ignore-external):hover:after, | |
.external-icon:not([href^='https://mdn.mozillademos.org']):not(.ignore-external):hover:before, | |
.waffle-sample .open-in-host:focus, | |
.waffle-sample .open-in-host:hover, | |
article a, | |
article a[name]:active, | |
article a[name]:focus, | |
article a[name]:hover { | |
text-decoration: none | |
} | |
.waffle-sample .o` | |
^^ this last line of the string is a incomplete css selector | |
*/ | |
return coverage; | |
} catch (err) { | |
console.error(err); | |
} finally { | |
cdp.close(); | |
chrome.kill(); | |
} | |
}) | |
.catch(err => console.error(err)); | |
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