Is there a list of what units are and are not supported?

I have noticed that ch, rem, vh, and vw do not work. ex sort of works but is usually wrong.

in, mm, cm, pt, pc, q, px, ex

As you say, ex is a tricky unit and is currently treated equivalently to 0.5em.

Thanks mike.

I ended up making a page to test units as attached, might be useful for someone. Green bars should be around half the view if the view is set to size A4.

Working: % px mm cm in pt pc em

Not accurate: ex

Not working ones are: ch, rem, vh, vw, vmin, vmax.

Chrome supports all of them, except they too seem to estimate ex and ch which is understandable.

1. unitsA4.html‎ 1.1 kB

Edited 4 Jul 2014 by dancotter

It's too bad about rem

I don't like em's cascading behaviour, I find it confusing.

Prince latest builds now support rem units!

Hi Mike,
fitting text into a box is one of my major obstacles. I'd like to think "vw" would help me in this scenario. Is support for vw anywhere on the roadmap?

Yes vw/vh units are on the roadmap. although we are not working on them right at this moment.

I randomly ran a web platform test on letter-spacing, which fails in Prince because "ch" isn't supported.

The Prince latest build now includes support for vw/vh/vmin/vmax units (and also pvw/pvh/pvmin/pvmax, relative to the page size including margins).

Edited 12 Feb 2021 by mikeday