remove unused style::restyle_hints::RestyleReplacements
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remove unused style::restyle_hints::RestyleReplacements from line 134
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Renamed constellation::Frame to constellation::BrowsingContext
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Now that script has `WindowProxy` rather than `BrowsingContext` objects, we can rename `Frame` in the constellation to `BrowsingContext`. In particular, this means that `FrameId`s are now `BrowsingContextid`s, which better captures their purpose (and they are used in a lot of places, not just the constellation).
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Scroll roots are no longer nested containers holding items, so instead
we need to track the offsets of each, carefully handling fixed position
items and stacking contexts that create new reference frames.
Additionally, we remove the complexity of the pre-computed page scroll
offset, instead opting to send script scrolls to the layout task in
order to more quickly have a ScrollState there that matches the
script's idea of the scroll world.
Fixes#16405.
Eliminate ScrollRootId
Just use WebRender's ClipId directly. This will allow us to create and
use ReferenceFrames in the future, if we need to do that. It will also
make it easier to have Servo responsible for creating the root
scrolling area, which will allow removing some old hacks in the future.
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Just use WebRender's ClipId directly. This will allow us to create and
use ReferenceFrames in the future, if we need to do that. It will also
make it easier to have Servo responsible for creating the root
scrolling area, which will allow removing some old hacks in the future.
Fix namespaces of elements created in XML documents
Correctly implement following step of [Dom Document Spec](https://dom.spec.whatwg.org/#dom-document-createelement):
> Let namespace be the HTML namespace, if the context object is an HTML document or context object’s content type is "application/xhtml+xml", and null otherwise.
Note, this will make following test in `tests/wpt/web-platform-tests/dom/nodes/Document-constructor.html` to fail, so related .ini file added to mark it as such:
```
test(function() {
var doc = new Document();
var a = doc.createElement("a");
// In UTF-8: 0xC3 0xA4
a.href = "http://example.org/?\u00E4";
assert_equals(a.href, "http://example.org/?%C3%A4");
}, "new Document(): URL parsing")
```
I'm not very familiar with specs, but from quick look at it, I'm doubtfull that it is valid in the first place. This is an "application/xml" document, so I don't see why it should encode a.href. Firefox also fails that.
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Access browsing context safely
Current browsing context accessor in `Document` unwraps the browsing context `Option` which prevents document to handle correctly the case when there is no browsing context.
This is the reason servo panics with `session-history.max-length=1` (https://github.com/servo/servo/issues/15877).
As it is my first contribution, I added a `safe` method to retrieve the browsing context rather than change the existing method, but I am happy to change if you think this is the right approach. I did not as well replace all existing method call to the `safe` method, to focus on fixing the issue.
If someone can give me a bit of guidance for the test, I will try to contribute one.
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Current browsing context accessor in Document unwrap the browsing context option which prevents document to handle correctly the case when there is no browsing context.
Improve behaviour of image elements that perform multiple requests
This addresses cases where image elements end up making multiple requests, as well as makes the element respond to additional relevant mutations that trigger updating the image data.
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This better reflects the text of the specification - rather than
queuing a task to dispatch the load evnet as soon as the document
loader is unblocked, we want to "spin the event loop until there
is nothing that delays the load event in the Document." Spinning
the event loop is a concept that requires running tasks
completely, hence we check the condition before returning to the
start of the event loop.
After this patch, when the page calls `requestAnimationFrame()` too many
times in the row without actually mutating the DOM, further calls to
`rAF` will actually perform the moral equivalent of `setTimeout(16)`.
This saves a lot of CPU time compared to actually waiting for the
vertical blanking interval, because waiting for that requires us to draw
the page.
Reduces CPU usage drastically on nytimes.com, which has a perpetual
`requestAnimationFrame()` loop that checks whether ads are in view.
Event handlers forwarded to a window check for window presence
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This change adds a check for the presence of a window in event handlers of `body` and `frameset` that are forwarded to the window.
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I'm new to both Servo and Rust — so any suggestions for improvement are very welcome.
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Constellation informs script about documents becoming inactive, active or fully active.
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This PR replaces the current freeze/thaw mechanism by messages from the constellation to script informing it about when documents become inactive, active or fully active.
This means we can now implement |Document::is_active()| which is used in |document.write|.
This PR also changes how timers work: previously they were initialized running, and were then frozen/thawed. This means there was a transitory period when timers were running even though the document was not fully active. With this PR, timers are initially suspended, and are only resumed when the document is made fully active.
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