Want to customize the style of text selected by users in the web page? It can be implemented through the ::selection pseudo-element of CSS. ::selection allows setting some properties such as background color, font color, etc. of selected text, but does not support borders or gradient backgrounds. When used, you can directly apply to specific tags or classes, such as p::selection or .highlight::selection. To ensure compatibility, it is recommended to add the -webkit- prefix to suit more devices. In addition, different selectors can be used to set different selection effects for various elements to improve the overall aesthetics of the page and user experience.

Want to change the color of the text on the web page? By default, the browser will highlight the user selected text with the color set by the system, but through the ::selection pseudo-element of CSS, you can customize this part of the style.

What is ::selection ?

::selection is a CSS pseudo-element that allows you to set specific styles for text selected by the user on the web page. For example, change the background color, font color, or even bold or adjust the font size.

It should be noted that this pseudo-element only supports a portion of CSS attributes:

• color
• background-color
• cursor
• caret-color
• outline and some text-related properties (such as text-shadow is also supported in some browsers)
  Others like borders and gradient backgrounds are not possible.

How to use ::selection ?

The basic syntax is very simple. Just add ::selection to the selector:

 p::selection {
  background-color: #ff9900;
  color: #ffff;
}

The above code will make the selected text in the paragraph turn orange and the font white.

If you want to apply a unified selection style to the text of the entire page, you can use ::selection with the wildcard selector:

 *::selection {
  background-color: lightblue;
  color: darkblue;
}

However, be aware that this will affect all elements, including the contents in the buttons and input boxes, and may cause some unexpected effects.

How to deal with compatibility issues?

Although mainstream modern browsers support ::selection , it is best to add -webkit- prefix in writing, especially on mobile browsers to be more secure:

 p::selection {
  background-color: #ff9900;
  color: #ffff;
}

p::-webkit-selection {
  background-color: #ff9900;
  color: #ffff;
}

Although most browsers no longer need prefixes, -webkit- version can still cover more devices, especially older iOS browsers.

Can it be set according to different elements?

sure. You can set different selected styles according to different tags, class names and even status:

 .highlight::selection {
  background-color: yellow;
  color: black;
}

.code-block::selection {
  background-color: #333;
  color: #0f0;
}

In this way, elements with .highlight class are selected with black characters on yellow background, while .code-block is a dark gray background with bright green text, which makes the visual distinction obvious and more design-like.

Basically that's it. Using ::selection can not only make the web style more unified, but also improve the user's reading experience. It is a small change but good effect.

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