Allow the left margin of a box which creates a block formatting context
to overlap with left floating boxes which are siblings in the document
tree.
Fixes#20233 and the comment layout on https://lobste.rs.
This change makes tree builder omit elements with "display: contents"
from the layout tree during construction. Their child elements are
instead directly appended to the parent element in layout tree.
For malformed tables which only have cells with span greater than 1, the
content sizes for row and column aren't initialized to non-zero values.
Avoid undefined behavior in such cases, which sometimes show up on
Wikipedia.
Auto margins used together with justify-content would previously
result in children being positioned outside their parent. This was
solved by letting auto margins take precedence when they are used,
which was already implemented to some extent before, but not
fully.
Containers with both flex reverse and justify content would
sometimes place children outside the container. This happened
because it assumed any reversed container would have items
aligned to the right, which isn't true when using eg. `flex-end`.
Both `justify-content: start` and `justify-content: end` are now
also independent of the reverseness.
After switching to fixed-point arithmetic in CSSPixels, it no longer
supports representing infinite values, which was previously the case
for remaining_free_space in FFC. Using Optional that is not empty only
when value is finite to store remaining_free_space ensures that
infinity is avoided in layout calculations.
In c66dbc99ee GFC was updated to use -1
as special value for the infinite growth limit. However, using Optional
instead reduces the risk of accidentally using -1 special value in
layout calculations.
Before this change, we always derived a box's baseline from its last
child, even if the last child didn't have any line boxes inside.
This caused baselines to slip further down vertically than expected.
There are more baseline alignment issues to fix, but this one was
responsible for a fair chunk of trouble. :^)
Using fixed-point saturated arithmetics for CSSPixels allows to avoid
accumulating floating-point errors.
This implementation is not complete yet: currently saturated
arithmetics implemented only for addition. But it is enough to not
regress any of layout tests we have :)
See https://github.com/SerenityOS/serenity/issues/18566
This is the preparation to use fixed-point to represent CSSPixels.
Previously, it was acceptable to divide CSSPixels by zero, resulting
in inf, but after migrating to fixed-point stored as an integer, it
would lead to undefined behavior.
This is preparation for introducing fixed-point CSSPixels in upcoming
commits.
Infinity is a valid state for the growth limit value of a grid track.
It was possible to use INFINITY when CSSPixels were represented using
floating point, but it won't work after the transition to fixed point,
which is represented using integers. This change addresses this by
using -1 as a special value to represent the infinite state of the
growth limit.
Follow the computing column measures section of the specification, which
gives an algorithm for setting intrinsic percentage widths when spanning
columns are involved.
As part of this move properties/methods to the correct subclass
(position related properties go under SVGTextPositioningElement).
SVG text element hierarchy:
SVGTextContentElement
^- SVGTextPositioningElement
^- SVGTextElement
^- SVGTSpanElement
^- SVGTextPathElement (TODO)
^- SVGTRefElement (TODO)
Change how we store type of columns. It was used where the specification
only distinguishes between percent and everything else, so it makes more
sense to store and use it as a boolean.
Make used widths of the columns a linear combination of two consecutive
sizing-guesses when the assignable table width is less than or equal to
the max-content sizing-guess, as the specification describes.
The specification says we should distribute excess width proportionally
to the width of the cell, not to the preferred increment. Doing the
latter leads to distributing all excess width to just the cells which
demand some increment, even if it's very modest. Moreover, there's code
which partially implements the correct criteria just below the one we
remove here.
Once we've resolved the used flex item width & height, we should allow
percentage flex item sizes to resolve against them instead of forcing
flex items to always treat percentages as auto while doing intrinsic
sizing layout.
Regressed in 8dd489da61.
We do this by piggybacking on FormattingContext helpers instead of
reinventing the wheel in FlexFormattingContext.
This fixes an issue where `min-width: fit-content` (and other
layout-dependent values) were treated as 0 on flex items.
This makes the cookie banners look okay on https://microsoft.com/ :^)
If an inline-block has a percentage height that relies on the auto
height of the containing block, it should always resolve to the
automatic height of the box, regardless of the percentage value. This
change may seem confusing, but it aligns with the behavior of other
engines.
This change implements following paragraph from placement algorithm in
the spec:
"If the largest column span among all the items without a definite
column position is larger than the width of the implicit grid, add
columns to the end of the implicit grid to accommodate that column
span."
There were places in the grid implementation code with copies of this
text, but those were completely unrelated to the code where they were
being pasted so I removed them.
Importantly, we now only consider overflow from descendants with
explicltly visible overflow, and only from descendants that have the
measured box as their containing block.
Also, we now measure scrollable overflow for all boxes, not just scroll
containers. This will allow us to fix a long-standing paint problem in
the next commit.
