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offsetHeight + 50 // 50 is an arbitrary fudge factor to compensate for borders and title bar. Each of these values will be calculated for the box size specified by the property being accessed.Protected void Page_Load(object sender, EventArgs e)Ĭontrol ctrl = LoadControl ('WebUserControl2.ascx') If the writing mode of your document is vertical, though, the blockSize will define the width while the inlineSize will define the height. The blockSize property defines the height of the element while the inlineSize defines the width.

Each of these properties will be an array that will almost always contain just one value which is an object with a blockSize and inlineSize property. These properties are borderBoxSize, contentBoxSize, and devicePixelContentBoxSize, and they perfectly line up with the 3 different box model types discussed earlier. There are also 3 additional properties that all provide additional information about the width/height of the element.

The most important properties are the target and contentRect since they tell you the majority of the information you need to know about which element is resizing and what its new size is. The entries array in the Resize Observer callback contains lots of useful information about the element. Const observer = new ResizeObserver ( entries => ) Resize Observer Entry

Javascript window resize