Find the absolute font-size of a relative font-size

user_4303073 0
Viewed 650

I use em as units for my fonts in combination with body {font-size:12px} (an absolute number, can be 20px or 14px...)

That works fine, but if I have multiple nested things, like

h4{
font-size:2em;
}
h4 span{
1.6em;
}
.parent_elementofthespan span.superspan{
font-size:1.3em;
}
.basecamp3rdpartyclass h4.span{
font-size:1.9!important;
...

Now, things get pretty complicated in calculating the actual absolute font-size of .parent_elementofthespan span.superspan for example.

Is there any chance of "seeing" the absolute font-size within a tool or something besides calculating it manually?

css
2 Answers

In Chrome Dev tools

F12 > Elements > Computed > font-size

A value in pixels will be displayed.

user_55616050

You should use rem unit wherever possible.
rem is relative to :root font size (html element in HTML but it could be <svg> or in other cases) so no hard calculations! In a nutshell, it's em without the cascade and 95% of the time it's what you need in your CSS.
Its compatibility is IE9+.

CSSViewer (a Firefox/Chrome extension) is way faster for checking font sizes (and other typographical properties like font weights and line heights, also color) on elements one after another than DevTools/Inspect.

  • Chrome extension
  • The original Firefox extension (has worked flawlessly for years BUT last update was 9 years ago: it may not work on Firefox 57+ coming in a few days :( RIP)

enter image description here

user_1376260
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