Allow supported window attributes to be replacable.
As seen in https://github.com/servo/servo/pull/21045 some Window attributes don't support JavaScript from being able to shadow and replace their values.
This PR adds all other attributes I could find that are supported by servo to be replaceable.
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textarea minLength/maxLength
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textarea minLength/maxLength
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Issue #20593: Implement proper checks in WebGLRenderingContext's getFramebufferAttachmentParameter().
Add missing input checks.
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add TextLength
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add TextLength in HTMLTextAreaElement
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Implement window.length DOM attribute.
Implements the `window.length` DOM attribute for enumerating frames on the document.
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Support cloning steps for textarea/input
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Implement read methods on FileReaderSync
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Implemented the read methods on the FileReaderSync struct according to https://w3c.github.io/FileAPI/#dfn-FileReaderSync
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improve spec compliance of window.close
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Improve the spec compliance of https://html.spec.whatwg.org/multipage/window-object.html#dom-window-close, mainly by implementing the steps related to [closing a browsing context](https://html.spec.whatwg.org/multipage/window-object.html#close-a-browsing-context)
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Don't forward GL parameter gets for constant limits.
This avoids IPC traffic for unchanging constants that are determined when the GL context is created. These changes require https://github.com/emilio/rust-offscreen-rendering-context/pull/123.
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Update type of custom element constructor
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Fix for document salvageable state
I noticed a bug where if the document was un-salavageable due to the presence of `beforeunload` listeners, this could be overwritten if there were no listeners for `unload`. This could also have happened if an iframe of the document had no listeners while the parent did.
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remove misleading spec url
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`pub fn scroll_area(&self)` in `node.rs` is only called by `fn ScrollHeight(&self)` and `fn ScrollWidth(&self)` in `element.rs`.
`scrolltop` and `scrollleft` are actually implemented in `element.rs`.
The misleading spec urls should be removed.
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Embedder handling of prompts and alerts
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Allow embedder to allow alerts and prompts, but via constellation forwarding messages from script.
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Issue #20623: Check the input to WebGLRenderingContext's clear().
Validate the input to this function as per specifications.
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Issue #20556: Implement proper checks in WebGLRenderingContext's bindBuffer()
Implement missing check, about deleted buffers.
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Webgl fixes
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Add gl.getParameter() support for webgl unpack settings, and remove some unreachable and incorrect error-generation code
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- [x] These changes fix#20553
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