CSS/text-size-adjust

CSS text-size-adjust

This page is for tracking the development of a standard 'text-size-adjust' property. There are three known vendor prefixed implementations of it: -moz-, -ms-, -webkit-.

Web developers are using at least 4 prefixed implementations in the wild, including -o-text-size-adjust which Opera does not implement (as of 2012-088 per Florian of Opera on the CSSWG telcon that morning).

- Tantek

property definition

• values: auto | none | <percentage>
• Initial value : auto for smartphone browsers supporting inflation, none in other cases (and then not modifiable)
• Applies to: all elements
• Inherited :yes
• <percentage> :yes, refer to the corresponding size of the text font
• Media: visual
• Computed value : the keyword or the percentage value
• Animatable: no

auto

mobile browsers may implement a text inflation algorithm

none

browser must not do any automatic text inflation

<percentage>

inflate text size by the <percentage> given

Text inflation ... (needs to be defined).

editor next actions

must for editor draft

• define text inflation (as requested by CSSWG 2012-088 telcon before checking in as editor's draft)

should for FPWD

define percentage values

The definition of <percentage> is not particularly clear.

• Need to figure out what iOS Safari actually *does* for percentages.

A somewhat reasonable guess might be that it sets a maximum inflation level, but relative to what? Is '0%' equivalent to 'none', or is '100%', or are they both different from 'none' in some way? If it actually just specifies the inflation that would be pretty bad.

• Create some test cases to figure out what iOS is doing for %s and test them on an iOS device (iPhone / iPod touch / iTouch).
• write-up percentage details accordingly

see also

• https://developer.mozilla.org/en/CSS/text-size-adjust
• http://dbaron.org/log/20111126-font-inflation
• -webkit-text-size-adjust
• –ms-text-size-adjust