Let's analyze the following code snippet:
<div style="width: 10em; float: left; padding: 0; margin: 0">
<input type="text" style="width: 10em"/>
</div>
The text field in this code does not fill up the entire parent DIV as one might anticipate. What could be the reason behind this unexpected behavior? Looking forward to hearing your insights.
the solution is font-sizes.
em represents 'size in relation to the current font-size'.
given that the default font-size of an input element is smaller than a div (as per browser defaults), 10em results in a different width.
this issue can be easily resolved by using the '%' unit:
<input type="text" style="width:100%"/>
Consider changing the width to 100% instead of using an em width:
<div style="width: 10em; float: left; padding: 0; margin: 0">
<input type="text" style="width: 100%"/>
</div>
Keep in mind that the text field will still have a padding and border - causing the width of 100% to overflow the containing div.
<!DOCTYPE html>
<html>
<head>
<title> issue </title>
</head>
<body>
<div style="width: 15em; float: right; padding: 0; margin: 0;background-color:blue;">
<input type="text" style="width: 90%; padding:0; margin:0"/>
</div>
</body>
</html>
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