Comparing input size attribute to div width attribute

I have a situation in my html page where I need an input component and a div component to be the same width. The input has a size attribute of 30, but using the style attribute with "width: 30ch" or "width: 30em" for the div doesn't seem to work as expected. The div ends up wider than the input instead of matching its size.

What attribute should I use to align the width of the div with the size attribute of the input?

Here is the code snippet:

<input type="text" readonly="yes" value="a" size="30" ID="b">
<div id="c" style="width: 30ch"></div>
htmlcss

Answer №1

The size attribute determines the visible width in "characters," but different browsers may interpret it differently. The ch unit, when supported by browsers, represents the width of the digit 0, providing a precise definition that is font-dependent. This makes the methods of setting width using these attributes incompatible with each other.

If you want to make a div element as wide as an input element following it, a simple solution is to enclose them in a table with a fixed layout. For those who prefer not to use HTML tables, a CSS table can be used instead. In this approach, you do not need to specify the width of the div element; it will inherit its width from the table formatting. Content and background color can be added to make the element's width visibly apparent.

<table style="table-layout: fixed" cellspacing=0>
<tr><td><input type="text" readonly="yes" value="a" size="30" ID="b">
<tr><td><div id="c" style="background: green">Hello world</div>
</table>

Answer №2

Experiment with adjusting the width attribute in both the input and div elements, and consider using percentage values for more flexibility.

Here is an example:

  <html>
  <input id="myInput"></input>
  <div id="myContainer"></div>
  </html>

CSS :

 #myContainer{
     width: y%(set y as needed)
 }

Answer №3

Implement this CSS style to ensure that both your input field and div element have the same width.

input#b, div#c {width:100px;}

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