Overview Open Chrome DevTools Simulate mobile devices with Device Mode Performance insights: Get actionable insights on your website's performance Lighthouse: Optimize website speed Animations: Inspect and modify CSS animation effects Changes: Track your HTML, CSS, and JavaScript changes Coverage: Find unused JavaScript and CSS CSS Overview: Identify potential CSS improvements Issues: Find and fix problems Media: View and debug media players information Memory Inspector: Inspect JavaScript ArrayBuffer Network conditions: Override the user agent string Recorder: Record, replay and measure user flows Security: Understand security issues WebAuthn: Emulate authenticators
Overview Open Chrome DevTools Simulate mobile devices with Device Mode Performance insights: Get actionable insights on your website's performance Lighthouse: Optimize website speed Animations: Inspect and modify CSS animation effects Changes: Track your HTML, CSS, and JavaScript changes Coverage: Find unused JavaScript and CSS CSS Overview: Identify potential CSS improvements Issues: Find and fix problems Media: View and debug media players information Memory Inspector: Inspect JavaScript ArrayBuffer Network conditions: Override the user agent string Recorder: Record, replay and measure user flows Security: Understand security issues WebAuthn: Emulate authenticators

Rendering tab overview

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Discover a collection of options that affect web content rendering with this overview of the Rendering tab features in DevTools.

Overview

The Rendering tab helps you:

  • Discover rendering performance issues. Spot repainting, layout shifts, layers and tiles, scrolling issues, see rendering statistics and Core Web Vitals.
  • Emulate CSS media features. Test how pages render with different CSS media features without manually specifying them in your code or testing environment.
  • Apply other useful effects. Highlight ad frames, emulate focus on a page, disable local fonts and image formats, enable an automatic dark theme, and emulate vision deficiencies.

Open the Rendering tab

To open the Rendering tab:

  1. Open DevTools.

  2. Press Command+Shift+P (Mac) or Control+Shift+P (Windows, Linux, ChromeOS) to open the Command Menu.

    Command menu, Rendering
  3. Start typing rendering, select Show Rendering, and press Enter. DevTools displays the Rendering tab at the bottom of your DevTools window.

Gotchas

In addition to opening the Rendering tab, you can also use the Command menu to search for and enable any option. Try typing an option name, for example, emulate.

Alternatively, you can open the Rendering tab in the following ways:

  • Press Esc to open the Drawer, and, in the top left corner, click More Tools More > Rendering.
  • In the top right corner, click More Options More > More Tools > Rendering.

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