"javascript:" urls: execute in correct global scope
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#### Summary
This pull request makes `javascript:` urls execute in the correct global scope.
#### Example
```html
<script> var x = 4; </script>
<!-- this branch: logs "4" -->
<!-- master: undefined variable error -->
<a href="javascript:console.log(x)">link</a>
```
#### Questions
I'm new to servo and rust, so I'm unsure about these changes. In particular:
* What's the appropriate place to evaluate the js?
* I moved it to `handle_navigate`, but I'm not sure if this will catch all occurrences of `javascript:` urls. I also don't know if this will execute in the correct thread and the correct window.
* What should I do with the result of the js evaluation?
* I just ignored it. The previous behavior displayed it as the content of a new page load.
---
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- [x] These changes fix#15147, #16718
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Remove this block and unindent the code one level.
Doing this required cloning `load_data.url` so that we could
later mutate `load_data.url` in the same block.
- generalize the eval_js_url function so it can be called from
multiple places.
- call it in htmliframeelement.
- if the js eval results in a non-string result, then it won't
navigate to a new page, so don't block on the new page loading.
Problem:
After aborting on a 204 or 205 status code, you could no longer
follow links on the page.
Cause:
`constellation.rs` ignores new LoadUrl requests since the aborted
one is in its `pending_changes` list.
Solution:
Send a message to constellation that lets it clean up its
`pending_changes` list.
Make some changes to javascript scheme url evaluation to bring it
closer to
https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigating-across-documents
- Evaluate the js before the page load so that it happens in the
correct `window` global.
- If the result is not a string, the response should be a 204.
This required saving some data in load_data, since it's not
possible to modify the response at the point where we're evaluating
the js.
cleanup embedder/compositor/constellation/script messages
Fix: #17226#17200#17201
This is work in progress. Some tests still fail.
I'd like to get early feedback as it's a pretty large PR.
There is nothing fundamentally new. Basically, I added TopLevelBrowsingContrextId to the relevant messages between the embedder, the compositor and the constellation, and enforced the PipelineId to be attached to each ScriptMsg (see #17201).
I unaliased all the ScriptMsg. It was getting difficult to understand the nature of the message as ScriptMsg was used aliased CompositorMsg sometimes (CompositorMsg is an actually type of message already). I renamed constellation_chan to script_to_constellation_chan, again, for clarification.
This cleanup code is necessary for #15934 and for tabs support.
/cc @asajeffrey can I ask you to look at this? No need for a formal review, I need feedback at this stage.
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Add [CEReactions] to webidls
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Relies on #17614
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Set navigation start value according to navigation timing spec
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#17651
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Implement custom element reactions
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Initial work for implementing custom element reactions: https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-reactions
---
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Properly set origin of fetch requests
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These changes aim to fix#15247
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- [x] These changes do not require tests because cors is already tested with different origins
These changes require changes in tests, but I need help with that (see comments below).
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Avoid panic when reloading a page with mouse event handlers
This PR fixes issue #16057, by nullifying `topmost_mouse_over_target` inside of the `handle_exit_pipeline_msg` method, in case owner document is the same as the pipeline document that is being destroyed.
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
Testing was done manually, by running `./mach run (-r|-d) "http://localhost:8000/minimal.html" `, where `minimal.html` contains `<div onmouseover="location.reload()" onmouseout="this.clientLeft">hi there</div>`.
r?@jdm
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Use microtasks to await a stable state.
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@jdm @KiChjang First pass at using microtasks to await a stable state. I ran into all sorts of problems to get it to compile, I think it's mainly related to the fact that the microtasks are stored in a `Vec`, which meant the `Runnalbe.handler(self: Box<Self>)` couldn't be called while iterating over the Vec... It compiles now although I haven't run any tests. I'm assuming I'm missing something fundamental and was hoping my changes would highlight the problems I run into, and you had a better idea of how to implement this... Perhaps we shouldn't pass a `Runnable` to `await_stable_state` at all?
---
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- [ ] These changes fix#15375 (github issue number if applicable).
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Mutation Observer API
Rebased from #16668.
- [X] `./mach build -d` does not report any errors
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- [X] These changes fix (partially) #6633
- [X] There are tests for these changes
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