9.1 First Line Indentation: the ‘text-indent’ property

Chapter 9 - Edge Effects - 9.1 First Line Indentation: the ‘text-indent’ property

Go to the relevant page of the specification.

text-indent-percentage-001 (ahem)

text-indent Percentage - basic cases
Ensure that text-indent +50% adds 50% of its containing block's width in front of the text.