Introduce ComputedUrl
<!-- Please describe your changes on the following line: -->
Use the new `ComputedUrl` type for computed types and `SpecifiedUrl` for specified types instead of using the `SpecifiedUrl` implementation for both.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#17625 (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because this is an implementation change and tests already exist.
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/17812)
<!-- Reviewable:end -->
style: Move all origin-specific cascade data to PerOriginCascadeData
<!-- Please describe your changes on the following line: -->
This is a preliminary refactoring in preparation for only rebuilding cascade data for origins that have a change. https://bugzilla.mozilla.org/show_bug.cgi?id=1382925
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18017)
<!-- Reviewable:end -->
Rework MediaType to be an atom-based struct instead of an enum.
MozReview-Commit-ID: 1Tfrs9PBkhA
<!-- Please describe your changes on the following line: -->
https://bugzilla.mozilla.org/show_bug.cgi?id=1371395https://reviewboard.mozilla.org/r/163194/
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18024)
<!-- Reviewable:end -->
Custom element upgrades
<!-- Please describe your changes on the following line: -->
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/17935)
<!-- Reviewable:end -->
These tests assumed that foo-á would create a HTMLUnknownElement; however,
foo-á is a valid custom element name; therefore, according to the spec, a
HTMLElement instace is created instead. I changed the name to fooá so a
HTMLUnknownElement is created as the test expects.
style: Only zoom absolute lengths.
As silly as it may seem to specify font-sizes using viewport units, we weren't
handling zoom for them correctly either.
Bug: 1388588
Reviewed-by: Manishearth
MozReview-Commit-ID: 3Q6phYAu5CE
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18022)
<!-- Reviewable:end -->
As silly as it may seem to specify font-sizes using viewport units, we weren't
handling zoom for them correctly either.
Bug: 1388588
Reviewed-by: Manishearth
MozReview-Commit-ID: 3Q6phYAu5CE
Make list-style-type animatable
<!-- Please describe your changes on the following line: -->
https://bugzilla.mozilla.org/show_bug.cgi?id=1388652
---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
set_list_style_type() for gecko needs an additional argument 'Device' [1], and
making list-style-type animtable makes AnimatedProperty::update() call the
set_list_style_type(). To avoid introducing the Device argument to the setter in
servo, this patch makes simply PropertyAnimation conditional build.
(Whereas in stylo, we don't use the setter for animation, we use clone_xx()
instead.)
[1] https://hg.mozilla.org/mozilla-central/file/1d042bcb2632/servo/components/style/properties/properties.mako.rs#l2667
stylo: Don't apply the rotation if it cannot be normalized.
According to the spec, the computed value of transform is as specified, but
with relative lengths converted into absolute lengths, so in Gecko, we do
nothing while computing the value of rotate3d(), and do normalization in
ProcessRotate3D(). If the direction cannot be normalized, we treat it as
an identity matrix.
However, in Servo, we do normalization in to_computed_value(), and looks
like we are trying to normalize any kind of direction vectors, so according
to the spec, let's move the normalization into Fragment::transform_matrix(),
and return an identity matrix if we cannot normalize its direction vector.
---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug 1388216](https://bugzilla.mozilla.org/show_bug.cgi?id=1388216).
- [X] These changes do not require tests because the added test is on Gecko side.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18016)
<!-- Reviewable:end -->
Clean up and simplify layout traversal code
Various refactorings of the code for traversing flow trees, including:
* Add a generic inorder traversal method
* Remove unused `traverse_postorder_absolute_flows` method
* Combine `compute_absolute_position` and `build_display_list` into a single traversal
* Move all generic traversal code into the `layout::traversal` module
And some changes to add documentation and more-accurate names:
* Fix spelling of `bottom_up_flow`
* Rename `compute_absolute_position` to `compute_stacking_relative_position`
* Change the mis-named `traverse_flow_tree_preorder` to `reflow`
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they are refactoring only
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18004)
<!-- Reviewable:end -->
