How to use the contrast checker in Edge DevTools
Jul 29, 2025 am 12:57 AMThe role of the contrast check tool in Edge DevTools is to help developers determine whether the contrast between text and background meets the accessibility standards. The operation steps are: Open DevTools; switch to the "Elements" page; right-click the target element to select "Check Contrast"; check the contrast ratio, whether the WCAG meets the standards and the recommended color value; actual usage scenarios include checking the readability of button text, card copy and background superimposing, and ensuring compliance when adjusting the design draft color; optimization suggestions are to modify the CSS color while observing changes, and timely feedback designer color matching issues to avoid rework.
The role of contrast checking tools in Edge Developer Tools (DevTools) is to help developers quickly determine whether the contrast between text and background in web pages meets the accessibility standards. Using this tool well can effectively improve the accessibility of the website, especially for users with vision limitations.

Find and open the Contrast Check Tool
Edge's DevTools integrates contrast checking functionality itself, but not as a panel, but is nested in "Element Checking".
The operation method is as follows:
- Open the Edge browser, press
F12
or right-click the page to select "Check" to open DevTools; - Switch to the “Elements” tab;
- Find the text element you want to check (such as a
<p></p>
or<h1></h1>
tag), right-click it, and select "Check Contrast" (may appear as "Contrast ratio" or similar prompt);
At this time you will see the contrast value between the text color and the background color and whether it meets the WCAG (Web Content Accessibility Guide).

Understand contrast results and meanings
When the contrast test results are displayed, the following information is usually included:
- Contrast ratio : For example, 4.5:1, which is the main indicator for measuring readability;
- Whether WCAG meets the standards : AA or AAA standards correspond to different readability requirements;
- Recommended color values : DevTools sometimes give the recommended color combination if the current contrast is not up to standard;
For example, if your text is gray #888 and the background is white #FFF, the contrast may be 6.7:1, which already meets the AA standard but does not meet the AAA. For the main content, AA is the basic requirement, and the title or large font can be appropriately relaxed.

Actual usage scenarios and optimization suggestions
In actual development, this tool is most commonly used in the following situations:
- Check whether the text on the button is clear and readable;
- Verify the readability of the copy and background image in the card component after superimposing it;
- When adjusting the color of the design draft, ensure that it is ultimately in compliance with the accessibility specification;
You can modify the color or background-color in CSS while observing the changes in contrast and quickly adjust the appropriate color scheme.
A little trick is: Sometimes the colors given by designers seem good-looking, but the contrast is not up to standard. At this time, you can use this tool to promptly report problems to avoid later rework.
Basically that's it. It is not complicated to use, but it is easily overlooked. Especially when doing enterprise-level projects or websites for the masses, remember to check the contrast of key areas more, which is a significant plus for user experience.
The above is the detailed content of How to use the contrast checker in Edge DevTools. For more information, please follow other related articles on the PHP Chinese website!

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