I've tested this manually, by clicking on the "baz" in code like
```js
var a = document.body.appendChild(document.createElement("a"));
a.textContent = "bar ";
a.setAttribute("href", "http://www.yahoo.com");
var b = a.appendChild(document.createElement("a"));
b.textContent = "baz";
```
Before this change, the click is trapped by `b` and ignored there; after this
change, the click passes through `b` to `a`, where it is handled.
Unfortunately, I haven't found a way to write an automated test.
This improves the encapsulation and consistency in our WebGL
implementation.
Also allows to implement new methods such as `getShaderSource()`.
It will also allow us to use `delete()` in the destructors of them (note
that we will want to keep track of them from the context).
Implement crypto.getRandomValues()
Didn't touch mozjs or rust-mozjs because implementing that in the code generator didn't seem too easy. I'm using the same workaround that the TextDecoder does.
Using the OsRng should be the right choice here? As the OS keeps state for us we wouldn't need to have a global rng instance to keep around.
Fixes#4666.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/6505)
<!-- Reviewable:end -->
Refactor #[jstraceable] to #[derive(JSTraceable)]
fixes#6524. I had to make an additional change not mentioned in the ticket - adding the `#[feature]` to enable deriving custom traits but I assume that's expected at this time.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/6529)
<!-- Reviewable:end -->
This commit was generated using the following commands:
```
find . -iname "*.webidl" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)github.io/https:\1github.io/g'
```
```
find . -iname "*.rs" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)github.io/https:\1github.io/g'
```
html5ever now uses the Tendril string type to minimize copying internally,
but Servo still converts from/to `String` at the boundary
(which involves copying).
Implement Named constructors and the Image constructor for HTMLImageElement
I'm not sure if I like how I mostly just duplicated the code in CodegenRust.py, so that might need to be refactored.
Instead of just calling it Image, we might want to call it ConstructorImage, to make it clear that it's a constructor. Anyone have an opinion on that?
There seems to be a bug in the HTMLImageElement getter/setter as the value is 0 regardless of what I do. This seems to be unrelated to my commits, so I'll investigate that separately.
<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/6110)
<!-- Reviewable:end -->
