# Finding Dead CSS

DevFeed: [Finding Dead CSS](<https://devfeed.tech/articles/finding-dead-css-45629.md>)

Original publisher: [Read original article](<https://csswizardry.com/2018/01/finding-dead-css/>)

Author: Harry Roberts

Published: 2018-01-17T14:25:19Z

Content type: tutorial

Language: en

Sources: [CSS Wizardry](<https://devfeed.tech/sources/css-wizardry.md>)

Topics: [CSS](<https://devfeed.tech/topics/css.md>), [Web Development](<https://devfeed.tech/topics/web-development.md>), [real user monitoring](<https://devfeed.tech/topics/real-user-monitoring.md>), [Server](<https://devfeed.tech/topics/server.md>)

Tags: [css](<https://devfeed.tech/tags/css.md>), [logs](<https://devfeed.tech/tags/logs.md>), [measurement](<https://devfeed.tech/tags/measurement.md>), [performance](<https://devfeed.tech/tags/performance.md>), [rum](<https://devfeed.tech/tags/rum.md>), [server](<https://devfeed.tech/tags/server.md>)

## AI overview

A practical technique for identifying dead CSS on a live website by monitoring whether a legacy selector renders. The method uses a transparent tracking GIF, a selector-specific URL parameter, and server logs to determine whether the code can likely be removed.

## Source excerpt

Finding dead or unused CSS on a live website