The width and height of elements, documents, browsers, and screens in JavaScript

1. Width and height of elements

　　Take the width as an example

• element. The width of the style.width style, which is the width of the style sheet that is written in the element's row.
  
• element. clientwidth visible area width, style width +padding
• Element. offsetwidth occupy width, style width +padding+border

2. Width and height of the document and browser window

Take the width as an example

　　

The width and height of elements, documents, browsers, and screens in JavaScript