How to set fixed width in SPAN element using css?

Hello guys,
Just recently i found one case that span element is not taking the width property.
For example:

<span style="width:40px">rat32.com </span>

In the above code width property and values have no meaning. So in order to make it working we need to add float:left property. So the solution is:

<span style="float:left;width:40px">rat32.com</span>

Now this will set the width of span element. Hope it helps.
If it helped you please comment. Have a nice day!! 🙂