How to customize resize symbols through CSS to match background color?

CSS Custom Resize Control Color: Challenges and Solutions

In web design, details determine success or failure. A consistent visual style is crucial, including resizing controls. This article discusses how to customize the color of the control through CSS to make it coordinate with the page background color.

Problem: Browser compatibility

Directly modify the style of the resize control, and there are differences in compatibility among different browsers. While ideally all browsers are expected to be consistent, there are challenges at the moment.

Solution: CSS pseudo-elements and browser compatibility considerations

We mainly use -webkit-resizer pseudo-element to try to customize the style of the resize control. The following code example shows how to modify its background and border colors:

 textarea {
  resize: both; /* Enable resize*/
  overflow: auto; /* Enable scrollbar when content overflows*/
}

textarea::-webkit-resizer {
  background-color: #your-background-color; /* Replace with your background color*/
  border: 1px solid #your-border-color; /* Replace with your border color*/
}

Important: -webkit-resizer is only valid in WebKit-based browsers such as Chrome and Safari. For other browsers such as Firefox, Edge, this method is invalid, and the control style will continue to use the browser's default style.

In addition, scroll bar styles may also affect the overall visual effect. We can use -webkit-scrollbar related pseudo-elements to customize:

 textarea::-webkit-scrollbar {
  width: 12px; /* scroll bar width*/
}

textarea::-webkit-scrollbar-thumb {
  background-color: #your-thumb-color; /* scrollbar slider color*/
  border-radius: 10px; /* rounded corners*/
}

textarea::-webkit-scrollbar-track {
  background-color: #your-track-color; /* scroll bar track color*/
}

Similarly, these -webkit-scrollbar properties also have browser compatibility issues and are only valid in WebKit kernel browsers.

Conclusion: Currently, it is difficult to customize the color of the controls completely across browsers through pure CSS. -webkit-resizer and -webkit-scrollbar provide ways to implement custom styles in WebKit browsers, but for other browsers you may want to consider using JavaScript or other alternatives for cross-browser compatibility. Future improvements to CSS specifications may provide more general solutions.

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