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Is it possible to set the height/width of an element in percent using JavaScript or jQuery?
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auto automatically computes the width such that the total width of the div fits the parent, but setting 100% will force the content alone to 100%, meaning the padding etc. will stick out of the div, making it larger than the parent. so setting the 'width' to 'auto' would be better? Yes, but that's the default anyway.
Try It: Set the width of an image using a percentage and resize your browser window. For the width attribute, you can also use percentages, where 100% is the total space available. So, if you wanted an image to be one quarter the width of the window, you could set width to 25% (one quarter of 100% is 25%).
width: 100%; will make the element as wide as the parent container. Extra spacing will be added to the element's size without regards to the parent.
document.getElementById('header').style.width = '50%'; If you are using Firebug or the Chrome/Safari Developer tools, execute the above in the console, and you'll see the Stack Overflow header shrink by 50%.
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