mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-11-09 15:28:40 +00:00
31 lines
997 B
Plaintext
31 lines
997 B
Plaintext
|
|
CSS Length Reference
|
|
To bound, or not to bound, that is the question
|
|
|
|
It's quite a reasonable request, really, and it's already been implemented
|
|
for HTML. That is, length bounding. It makes little sense to let users
|
|
define text blocks that have a font-size of 63,360 inches (that's a mile,
|
|
by the way) or a width of forty-fold the parent container.
|
|
|
|
But it's a little more complicated then that. There are multiple units
|
|
one can use, and we have to a little unit conversion to get things working.
|
|
Here's what we have:
|
|
|
|
Absolute:
|
|
1 in ~= 2.54 cm
|
|
1 cm = 10 mm
|
|
1 pt = 1/72 in
|
|
1 pc = 12 pt
|
|
|
|
Relative:
|
|
1 em ~= 10.0667 px
|
|
1 ex ~= 0.5 em, though Mozilla Firefox says 1 ex = 6px
|
|
1 px ~= 1 pt
|
|
|
|
Watch out: font-sizes can also be nested to get successively larger
|
|
(although I do not relish having to keep track of context font-sizes,
|
|
this may be necessary, especially for some of the more advanced features
|
|
for preventing things like white on white).
|
|
|
|
vim: et sw=4 sts=4
|