The ascent-override CSS descriptor defines the ascent metric for the font. The ascent metric is the height above the baseline that CSS uses to lay out line boxes in an inline formatting context.


ascent-override: normal;
ascent-override: 90%;


The default value. When used the metric value is obtained from the font file.
A <percentage> value.

Formal definition

Value not found in DB!

Formal syntax



Overriding metrics of a fallback font

The ascent-override property can help when overriding the metrics of a fallback font to better match those of a primary web font.

@font-face {
  font-family: web-font;
  src: url("");

@font-face {
  font-family: local-font;
  src: local(Local Font);
  ascent-override: 125%;


Specification Status Comment
CSS Fonts Module Level 4
The definition of 'ascent-override' in that specification.
Working Draft

Browser compatibility

BCD tables only load in the browser

See also