This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The clientWidth read-only property of the Element interface is zero for inline elements and elements with no CSS; otherwise, it's the inner width of an element in pixels. It includes padding but excludes borders, margins, and vertical scrollbars (if present).
When clientWidth is used on the root element (the <html> element), (or on <body> if the document is in quirks mode), the viewport's width (excluding any scrollbar) is returned.
An integer.
| Specification |
|---|
| CSSOM View Module> # dom-element-clientwidth> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
clientWidth |
1 | 12 | 1 | 8 | 3 | 18 | 4 | 10.1 | 1 | 1.0 | 4.4 | 1 |
HTMLElement.offsetWidthElement.scrollWidthElement.clientHeightElement.clientLeftElement.clientTopElement.getBoundingClientRect()
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https://developer.mozilla.org/en-US/docs/Web/API/Element/clientWidth