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|**Console** tool | An intelligent, rich command line within DevTools. A great companion tool to use with others tools. Provides a powerful way to script functionality, inspect the current webpage, and manipulate the current webpage using JavaScript. |[Console overview](console/index.md)|
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|**Coverage** tool | Help you find unused JavaScript and CSS code, to speed up your page load and save your mobile users cellular data. |[Find unused JavaScript and CSS code with the Coverage tool](coverage/index.md)|
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|**Crash analyzer** tool | Analyze crashes of your web app. You can input a JavaScript production stack trace, such as for non-fatal JavaScript exceptions, and then have your source maps applied to the stack trace so that you can debug faster. |[Crash analyzer tool](./crash-analyzer/index.md)|
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|**CSS Overview** tool | Help you better understand your page's CSS and identify potential improvements. |[CSS Overview tool](css/css-overview-tool.md)|
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|**CSS overview** tool | Help you better understand your page's CSS and identify potential improvements. |[CSS overview tool](css/css-overview-tool.md)|
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|**Detached Elements** tool | To increase the performance of your webpage, find detached elements that the browser can't garbage-collect, and then identify the JavaScript object that's still referencing the detached element. Then change your JavaScript to release the element, to reduce the number of detached elements on your page, increasing page performance and responsiveness. |[Debug DOM memory leaks by using the Detached Elements tool](memory-problems/dom-leaks.md)|
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|**Developer Resources**| Shows resource URLs for the webpage. |[Developer Resources tool](developer-resources/developer-resources.md)|
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|**Developer resources**| Shows resource URLs for the webpage. |[Developer resources tool](developer-resources/developer-resources.md)|
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|**Device Emulation**| Use the **Device Emulation** tool, also called _Device Simulation Mode_ or _Device Mode_, to approximate how your page looks and responds on a mobile device. |[Emulate mobile devices (Device Emulation)](device-mode/index.md)|
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|**Elements** tool | Inspect, edit, and debug your HTML and CSS. You can edit in the tool while displaying the changes live in the browser. Debug your HTML using the DOM tree, and inspect and work on the CSS for your webpage. |[Inspect, edit, and debug HTML and CSS with the Elements tool](elements-tool/elements-tool.md)|
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|**Inspect** tool | Use the **Inspect** tool to see information about an item within a rendered webpage. When the **Inspect** tool is active, you _hover_ over items in the webpage, and DevTools adds an information overlay and grid highlighting on the webpage. |[Analyze pages using the Inspect tool](css/inspect.md)|
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---
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title: Optimize CSS styles with the CSS Overview tool
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description: The CSS Overview tool in Microsoft Edge DevTools.
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title: Optimize CSS styles with the CSS overview tool
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description: The CSS overview tool in Microsoft Edge DevTools.
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author: MSEdgeTeam
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ms.author: msedgedevrel
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ms.topic: conceptual
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ms.service: microsoft-edge
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ms.subservice: devtools
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ms.date: 09/07/2022
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---
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# Optimize CSS styles with the CSS Overview tool
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# Optimize CSS styles with the CSS overview tool
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The **CSS Overview** tool captures an overview of the CSS code used on a webpage and displays a report about the colors, fonts, and media-queries used. The tool also identifies potential color contrast issues and unused CSS declarations issues.
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The **CSS overview** tool captures an overview of the CSS code used on a webpage and displays a report about the colors, fonts, and media-queries used. The tool also identifies potential color contrast issues and unused CSS declarations issues.
1. Navigate to the [TODO list demo app](https://microsoftedge.github.io/Demos/demo-to-do/) in Microsoft Edge, or to your own webpage.
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1. Open DevTools by pressing **F12** or **Ctrl+Shift+I** (Windows, Linux) or **Command+Option+I** (macOS).
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1. In the main toolbar, click **More Tools** and select **CSS Overview** from the list.
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1. In the main toolbar, click **More Tools** and select **CSS overview** from the list.
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1. The **CSS Overview** tool opens and shows a welcome screen.
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1. The **CSS overview** tool opens and shows a welcome screen.
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Start using the tool by capturing a new report. Click **Capture overview**, the overview report appears.
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If you make changes to your webpage and want to view a new report, click **Clear overview** and then capture a new overview.
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To view the sections of the report, use the scrollbar or click the sections in the sidebar:
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<!-- ------------------------------ -->
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To see the list of non-simple selectors, on the overview report, click **Non-simple selectors** in the sidebar to scroll to the relevant section of the report:
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From here, you can further analyze the impact of your changes and individual selector performance by using the **Selector Stats** feature in the **Performance** tool.
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1. Open DevTools by pressing **Ctrl+Shift+I** (Windows, Linux) or **Command+Option+I** (macOS).
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1. In the main toolbar, click **More Tools** and select **CSS Overview** from the list.
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1. In the main toolbar, click **More Tools** and select **CSS overview** from the list.
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1. In the **CSS Overview** tool, click **Capture overview** and then click **Colors** in the overview report sidebar.
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1. In the **CSS overview** tool, click **Capture overview** and then click **Colors** in the overview report sidebar.
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1. Scroll down to the **Contrast issues** sub-section to view all issues.
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1. To view the elements that have a particular color contrast issue, choose the issue you want to fix and click **Text**. The corresponding elements are listed.
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<!-- ------------------------------ -->
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#### View and fix color contrast issues in the CSS Overview tool
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#### View and fix color contrast issues in the CSS overview tool
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The **CSS Overview** tool now displays a list of elements on your page that have color contrast issues. The [CSS Overview Accessible Colors Demo](https://css-overview-accessible-colors-demo.glitch.me) page has an example of a color contrast issue.
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The **CSS overview** tool now displays a list of elements on your page that have color contrast issues. The [CSS overview Accessible Colors Demo](https://css-overview-accessible-colors-demo.glitch.me) page has an example of a color contrast issue.
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To view a list of elements that have a color contrast issue, on **Contrast issues**, click **Text**. To open the element in the **Elements** tool, click an element in the list. To help fix contrast issues, the Microsoft Edge DevTools [automatically provide color suggestions](../08/devtools.md#accessible-color-suggestion-in-the-styles-pane).
Update: This feature has been released and is no longer experimental.<!-- To enable this experiment, under **Settings** > **Experiments**, select the **CSS Overview** checkbox. -->
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Update: This feature has been released and is no longer experimental.<!-- To enable this experiment, under **Settings** > **Experiments**, select the **CSS overview** checkbox. -->
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title: What's New in DevTools (Microsoft Edge 112)
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description: "The Performance tool can now unminify JavaScript running in out-of-process iframes, the CSS Overview tool displays a list of non-simple selectors for quick performance wins, and more."
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description: "The Performance tool can now unminify JavaScript running in out-of-process iframes, the CSS overview tool displays a list of non-simple selectors for quick performance wins, and more."
<!-- Subtitle: Non-simple selectors can be common culprits for long-running Recalculate Styles events in the Performance tool. Take a quick snapshot in the CSS Overview tool to see your non-simple selectors. -->
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<!-- Subtitle: Non-simple selectors can be common culprits for long-running Recalculate Styles events in the Performance tool. Take a quick snapshot in the CSS overview tool to see your non-simple selectors. -->
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The **CSS Overview** tool has a new **Non-simple selectors** section, which displays a list of non-simple CSS selectors when you take an overview snapshot of your webpage's CSS. This list of non-simple CSS selectors in the **CSS Overview** tool provides a quick way to identify common culprits that might be causing long-running **Recalculate Styles** events:
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The **CSS overview** tool has a new **Non-simple selectors** section, which displays a list of non-simple CSS selectors when you take an overview snapshot of your webpage's CSS. This list of non-simple CSS selectors in the **CSS overview** tool provides a quick way to identify common culprits that might be causing long-running **Recalculate Styles** events:
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This is a list of selectors that could possibly reduce performance. To determine whether these selectors are actually reducing performance, use the **Selector Stats** feature in the **Performance** tool.
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To analyze individual CSS selector performance and analyze the impact of your changes, use the **Selector Stats** feature in the **Performance** tool.
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See also:
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*[Optimize CSS styles with the CSS Overview tool](../../../css/css-overview-tool.md)
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*[Optimize CSS styles with the CSS overview tool](../../../css/css-overview-tool.md)
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*[Analyze CSS selector performance during Recalculate Style events](../../../evaluate-performance/selector-stats.md)
## Accessibility improvements for the CSS Overview tool
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## Accessibility improvements for the CSS overview tool
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<!-- Subtitle: The CSS Overview tool is now easier to use with assistive technology such as screen readers. -->
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<!-- Subtitle: The CSS overview tool is now easier to use with assistive technology such as screen readers. -->
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In Microsoft Edge 112, the **CSS Overview** tool was updated to display a list of non-simple selectors when taking an overview snapshot of a webpage's CSS. In Microsoft Edge 114, the **Non-simple selectors** section of the **CSS Overview** tool is now easier to use with assistive technology, such as screen readers.
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In Microsoft Edge 112, the **CSS overview** tool was updated to display a list of non-simple selectors when taking an overview snapshot of a webpage's CSS. In Microsoft Edge 114, the **Non-simple selectors** section of the **CSS overview** tool is now easier to use with assistive technology, such as screen readers.
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When you click a selector, or navigate to a selector and then press **Enter**, screen readers now announce "Copied CSS selector":
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See also:
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*[CSS Overview tool displays non-simple selectors for quick performance gains](../04/devtools-112.md#css-overview-tool-displays-non-simple-selectors-for-quick-performance-gains) in _What's New in DevTools (Microsoft Edge 112)_.
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*[Non-simple selectors](../../../css/css-overview-tool.md#non-simple-selectors) in _Optimize CSS styles with the CSS Overview tool_.
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*[CSS overview tool displays non-simple selectors for quick performance gains](../04/devtools-112.md#css-overview-tool-displays-non-simple-selectors-for-quick-performance-gains) in _What's New in DevTools (Microsoft Edge 112)_.
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*[Non-simple selectors](../../../css/css-overview-tool.md#non-simple-selectors) in _Optimize CSS styles with the CSS overview tool_.
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*[Navigate DevTools with assistive technology](../../../accessibility/navigation.md)
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