Currently following Mozilla putting stuff in /dom for additional porting,
but it's actually the wrong location since it belongs in /netwerk with
the other code that deals with http headers.
For sake of ease of use, converted to boolean functions that just assume "false"
in case of errors.
Note: Mozilla makes special arrangements for .onion addresses as well but
we explicitly do not adopt that. TOR browser can do that all day if it wants.
This patch adds an enumerable, configurable, readonly attribute "webdriver" to
the Navigator object. The attribute is always false because we do not support
WebDriver or scripted automation.
The navigator.webdriver attribute is meant as an indication to web authors that
a document is visited by WebDriver. It is important to stress that it is not
meant as a way to detect that a website is being visited by a browser automation
tool or bot, but as a tool for web documents to take alternate code paths.
On the off-chance exposing navigator.webdriver turns out to be catastrophic,
we put it behind a new preference dom.webdriver.enabled that controls its
exposure.
According to the original SVG spec, the SVG element in documents had to follow
special rules as to what was allowed for width/height attributes. This is no
longer the case, so we can decouple it from whatever internal units SVG/XML
language uses and allow all units like every other element.
This implementation is different than Mozilla, not indirectly queueing cancel
tasks to be arbitrarily ordered, but rather synchronously close in reverse
top layer order.
This adds a pseudo-class `:-moz-modal-dialog` to be able to track whether the
dialog is in the top layer in CSS.
This implements default styling for modal dialogs following the HTML standard.
Slightly off-extreme color scheme chosen for unstyled <dialog> elements.
Fullscreen stack isn't part of the spec anymore; it's been changed to a more
generic version called Top Layer stack, which is being used by both full-screen
APIs and dialog elements.
This patch refactors it to Top Layer stack so that it can be reused for dialog
elements.
Top Layer stack spec: https://fullscreen.spec.whatwg.org/#new-stacking-layer
