# Look Inside Any Page with Developer Tools

Open the browser's developer tools on any page, find every CSS rule applied to an element, read what a crossed-out line means, and try a change live before you copy it into your stylesheet.

![Cheat sheet: Look Inside Any Page with Developer Tools](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/e576a6dcb10149e1b77acd8c4be599a5.webp)

- Category: CSS
- Level: Novice
- Tags: Browser default styles, CSS, CSS rule, Declaration (css), Developer Tools, web-development
- Updated: November 1, 2026

Source: https://www.ask-codey.com/cheat-sheets/css-developer-tools-cheat-sheet