Detailed explanation of offsetwidth attribute

offsetWidth is a read-only property used to obtain the visible width of an element (including the width of the border, padding, and vertical scroll bar).

Specifically, offsetWidth returns an integer value, indicating the entire width of the element, including the following parts:

• Content area width: the width of the element content , excluding borders and padding.

• Left and right border width: If there are left and right borders, add their widths.

• Left and left padding width: The width of the left and right padding of the element.

• Vertical scroll bar width: If the element's content overflows and a vertical scroll bar is displayed, the width of the scroll bar is taken into account.

It should be noted that the value of offsetWidth is a rounded integer. Additionally, offsetWidth returns 0 if the element's display property is set to "none".

Usage example:

var element = document.getElementById('myElement');
var width = element.offsetWidth;console.log('元素的可见宽度为：', width, 'px');

Summary: offsetWidth is used to get the visible width of the element, including the width of the border, padding and vertical scroll bar. It is a read-only property.

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