There are two main CSS properties that control text selection highlighting: user-select and -webkit-user-select. These properties are used to specify whether or not users are able to select text on the web page.

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To disable text selection highlighting in CSS, you can set the value of the user-select property to none:

body {
   -webkit-user-select: none;  /* for Safari */
   -moz-user-select: none;     /* for Firefox */
   -ms-user-select: none;      /* for Internet Explorer */
   user-select: none;          /* for modern browsers */

In this example, the user-select property is applied to the body element, which means that text selection highlighting will be disabled for the entire page. If you want to disable text selection highlighting for a specific element, simply apply the property to that element instead of the body element.

It’s important to note that the -webkit-user-select and -moz-user-select properties are vendor-specific extensions, and are used to ensure compatibility with Safari and Firefox, respectively. The -ms-user-select property is used for compatibility with Internet Explorer. The standard user-select property should work in all modern browsers.

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