Margin collapsing is a bit confusing, but if I understand correctly,
when collapsing a box's top margin with the vertically adjacent
sibling box above, we should "skip over" empty (0-height) boxes and
collapse their margin with *their* vertically adjacent sibling box
above, etc. Iterating until we hit the first non-empty in-flow block.
This pulls up the bottom part of the face on ACID2. :^)
This patch adds a Web::Timer object that represents a single timer
registration made with window.setTimeout() or window.setInterval().
All live timers are owned by the DOM Window object.
The timers can be stopped via clearTimeout() or clearInterval().
Note that those API's are actually interchangeable, but we have to
support both.
This patch implements most of the HTML fragment parsing algorithm and
ports Element::set_inner_html() to it. This was the last remaining user
of the old HTML parser. :^)
Instead of storing the three-part specificy for every selector,
just mash them together into a 32-bit value instead.
This saves both space and time, and matches the behavior of other
browser engines.
We could previously place a box next to a preceding sibling with
position:fixed, which is wrong since fixed-position elements are taken
out of the normal flow.
When highlighting a node in the inspector, we now paint three overlays:
- The content box (magenta)
- The padding box (cyan)
- The margin box (yellow)
This makes it a lot easier to debug layout issues.
Sometimes we end up with an empty line box at the bottom of a block.
Instead of worrying about this in all the places we split into lines,
just remove the trailing box (if any) after splitting is finshed.
To make this possible, I also had to give each LayoutNode a Document&
so it can resolve document-specific colors correctly. There's probably
ways to avoid having this extra member by resolving colors later, but
this works for now.
This patch also adds the ability for Length to contain percentage
values. This is a little off-spec, but will make storing and dealing
with lengths a lot easier.
To resolve a Length to a px-or-auto Length, there are now helpers
for that. After calling them, you no longer have to think about
em, rem, %, and such things.
StyleProperties is really only the specified "input" to what eventually
becomes the used/computed style we use for layout and painting.
Unlike StyleProperties, LayoutStyle will have strongly typed values for
everything it contains (i.e no CSS::ValueID or strings, etc.)
This first patch moves z-index into LayoutStyle.
This avoids having to query the StyleProperties hash map whenever we
need to know if an element is absolutely positioned. This was extremely
hot in interactive window resize profiles.
