Is the line-height percentage relative to the viewport or the font size?

Can anyone help me understand the line-height property better? How does it work when set in %?

When using: line-height: normal; line-height: 1.6; line-height: 80%; What is the percentage relative to?

Answer №1

When a line-height is specified as a percentage %, it will be relative to the calculated font size of the element.

The MDN documentation on line-height provides a thorough explanation with examples:

normal

The value depends on the user agent. Desktop browsers, such as Firefox, typically use a default value around 1.2, based on the element's font-family.

<number> (unitless)

The computed value is obtained by multiplying this unitless <number> by the element's font size. In most cases, setting line-height in this way is recommended to prevent unexpected results from inheritance.

<length>

The specified <length> affects the calculation of the line box height. Using em units may lead to unexpected outcomes.

<percentage>

This value is determined relative to the element's font size. The computed value is the product of this <percentage> and the element's computed font size. Using percentage values for line-height can sometimes yield unforeseen results (as shown in the second example).

A similar explanation can be found in the CSS Level 2 (Revision 1) specification for line-height.

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