Implement `min-width` and `max-width`

[pcwalton]

Needed for Acid2 line 1.

[ILyoan]

Is anybody working on this? or I'll try to implement this.

[jdm]

I am not aware of any prior work.

[larsbergstrom]

Needed for #1366.

[pradeep90]

We still need to implement min-width and max-width for floats and other elements.
The relevant algorithm is at http://www.w3.org/TR/CSS2/visudet.html#min-max-widths

For non-replaced elements, the algorithm is the same: calculate width normally; if it is greater than max-width, re-calculate using max-width, etc.
BlockFlow::compute_block_margins implements this algo right now.

So, all we would need to do further for non-replaced elements is make compute_block_margins a general function which will call the specific margin-calculation function within it:

• compute_horiz for blocks
• compute_float_margins for floats
  and so on

[pcwalton]

I didn't notice any problems in Acid2 related to this. Is this done enough to move off the milestone?

[pradeep90]

min-width doesn't even appear in acid2.html
max-width appears only in this line -

.picture p { position: fixed; margin: 0; padding: 0; border: 0; top: 9em; left: 11em; width: 140%; max-width: 4em; height: 8px; min-height: 1em; max-height: 2mm; /* min-height overrides max-height, see 10.7 \
*/ background: black; border-bottom: 0.5em yellow solid; }

I think replaced elements with an intrinsic ratio still need to be handled in the long-term.
But in the above line, it's not a replaced element, so I think we're done for Acid2 min-width and max-width.

[pradeep90]

Work still left to do in general (not for Acid2):
Handle replaced elements with an intrinsic ratio and both 'width' and 'height' specified as 'auto'.
This involves the different cases in the table in CSS Section 10.4 - http://www.w3.org/TR/CSS2/visudet.html#min-max-widths

[pcwalton]

I think we should close this in favor of more specific bugs.