Element: scrollWidth property

The Element.scrollWidth read-only property is a measurement of the width of an element's content, including content not visible on the screen due to overflow.

The scrollWidth value is equal to the minimum width the element would require in order to fit all the content in the viewport without using a horizontal scrollbar. The width is measured in the same way as clientWidth: it includes the element's padding, but not its border, margin or vertical scrollbar (if present). It can also include the width of pseudo-elements such as ::before or ::after. If the element's content can fit without a need for horizontal scrollbar, its scrollWidth is equal to clientWidth

Note: This property will round the value to an integer. If you need a fractional value, use element.getBoundingClientRect().

Value

An integer.

Examples

Detecting overflowing content

In this example, we use the scrollWidth property to check if the content of an element is overflowing its boundaries. We have two div elements, the first with a width of 100px, and the second without a fixed width. Their content is exactly the same, and we display a message about whether each one is overflowing its container.

HTML

html
<div id="div1">FooBar-FooBar-FooBar-FooBar</div>
<button id="button1">Check for overflow</button>
<pre id="log1"></pre>
<div id="div2">FooBar-FooBar-FooBar-FooBar</div>
<button id="button2">Check for overflow</button>
<pre id="log2"></pre>

CSS

css
div {
  padding: 0.15em;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

button {
  margin: 0.15em 0 0.5em 0;
}

pre {
  margin: 0.5em 0;
}

#div1 {
  width: 100px;
}

#log1 {
  margin-bottom: 2em;
}

JavaScript

js
const button1 = document.getElementById("button1");
const button2 = document.getElementById("button2");

const div1 = document.getElementById("div1");
const div2 = document.getElementById("div2");

const log1 = document.getElementById("log1");
const log2 = document.getElementById("log2");

// Check if the scrollWidth is bigger than the offsetWidth or not
function isOverflowing(element) {
  return element.scrollWidth > element.offsetWidth;
}

function checkOverflow(element, log) {
  if (isOverflowing(element)) {
    log.innerText = `Content is overflowing, scrollWidth is ${element.scrollWidth}px`;
  } else {
    log.innerText = `No overflows, scrollWidth is ${element.scrollWidth}px`;
  }
}

button1.addEventListener("click", () => {
  checkOverflow(div1, log1);
});

button2.addEventListener("click", () => {
  checkOverflow(div2, log2);
});

Result

Click the buttons to check if the content is overflowing the containers.

Specifications

Specification
CSSOM View Module
# dom-element-scrollwidth

Browser compatibility

BCD tables only load in the browser

See also