What's the Best Alternative to CSS's calc() Function for Browser Compatibility?

Calc Function Alternative for CSS

The calc() function offers a convenient way to dynamically calculate values in CSS. However, it may not be supported in older browsers like IE 5.5 and certain mobile browsers. Here's an alternative approach that works better across a wider range of browsers:

Box-sizing: border-box

Almost every instance of calc(100% - ) can be replaced by setting box-sizing: border-box; on one element and padding or margin on the other. For instance, to dynamically set the width of a div element:

Original Approach (with calc()):

width: calc(100% - 500px);

Alternative Approach (without calc()):

.sidebar {
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  background: orange;
}

.content {
  padding-left: 300px;
  width: 100%;
  box-sizing: border-box;
  background: wheat;
}

Compatibility:

This alternative approach supports most major browsers, including IE 5.5 and above, Opera, and Android browsers.

Note: This solution relies on a precise value for the element's dimensions. If the element's dimensions are fluid or cannot be determined in advance, calc() may be the only viable option.

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