Implements https://github.com/whatwg/html/issues/6962 . Improves performance
when <meta charset> occurs in head but after the first kilobyte and aligns
behavior better with WebKit and Blink.
The main change is to avoid reloads when meta appears within head but
after the first kilobyte. Prior to this change, Gecko reloaded in that
case (in compliance with the spec!) even though WebKit and Blink did not.
Differences from WebKit and Blink:
* WebKit and Blink honor <meta charset> in <noscript>. This implementation
does not.
* WebKit and Blink look for meta as if the tree builder was unaware of
foreign content. This implementation is foreign content-aware. This
makes a difference for CDATA sections that contain a > before the meta
as well as style and script elements within foreign content. This could
happen if the CDATA section that has mysteriously been introduced around
a what looks like a meta tag also contains another prior tag-looking
run of text.
* This implementation processes rel=preload and speculative loads that are
seen before <meta charset> has been seen. WebKit and Blink instead first
look for the meta and rewind before starting speculative parsing.
* Unlike WebKit, if there is neither an honored meta nor syntax resembling
an XML declaration, detection from content takes place (as in Blink).
* Unlike Blink, if there is neither an honored meta nor syntax resembling
an XML declaration, the detection from content is not dependent of network
buffer boundaries.
* Unlike Blink, detection from content can trigger a reload at the end of
the stream if the guess made at that point differs from the first guess.
(See below for the definition of the input to the first guess.)
Differences from the old spec and Gecko previously:
* Meta inside script and RCDATA elements is no longer honored.
* Late meta is now ignored and no longer triggers a reload.
* Later meta counts as early enough meta: In addition to the previous
meta within the first 1024 bytes, now a meta that started within the first
1024 bytes counts as early enough. Additionally, if by then there hasn't
been a template start tag and head hasn't ended, meta occurring before the
earlier of the end of the head or a template start tag counts as early
enough.
* Meta now counts as not-late even if the encoding label has numeric
character reference escapes.
* Syntax resembling an XML declaration longer than a kilobyte is honored if
there is no honored meta.
* If there is neither an honored meta nor syntax resembling an XML declaration,
the initial chardetng scan is potentially longer than before: the first 1024
bytes, the token spanning the 1024-byte boundary if there is such a token,
and, if by then head hasn't ended and there hasn't been a template start tag
until the end of the template start tag or the end of the token that causes
head to end, ever comes first. However, if the token implying the end of the
head is a text token, bytes only to the end of the previous non-text token is
considered. (This definition avoids depending on network buffer boundaries.)
* XML View Source now uses the code for syntax resembling an XML declaration
instead of expat for extracting the internal encoding label.
Reftest are added as both WPT and Gecko reftests in order to test both http:
and file: URL scenarios. The Gecko tests retain the WPT <link> tags in order
to use the exact same bytes.
An encoding declaration has been added to a number of old tests that didn't
intend to test the new speculation behavior especially in the context of
https://bugzilla.mozilla.org/show_bug.cgi?id=1727750 .
Differential Revision: https://phabricator.services.mozilla.com/D125808
Implements https://github.com/whatwg/html/issues/6962 . Improves performance
when <meta charset> occurs in head but after the first kilobyte and aligns
behavior better with WebKit and Blink.
The main change is to avoid reloads when meta appears within head but
after the first kilobyte. Prior to this change, Gecko reloaded in that
case (in compliance with the spec!) even though WebKit and Blink did not.
Differences from WebKit and Blink:
* WebKit and Blink honor <meta charset> in <noscript>. This implementation
does not.
* WebKit and Blink look for meta as if the tree builder was unaware of
foreign content. This implementation is foreign content-aware. This
makes a difference for CDATA sections that contain a > before the meta
as well as style and script elements within foreign content. This could
happen if the CDATA section that has mysteriously been introduced around
a what looks like a meta tag also contains another prior tag-looking
run of text.
* This implementation processes rel=preload and speculative loads that are
seen before <meta charset> has been seen. WebKit and Blink instead first
look for the meta and rewind before starting speculative parsing.
* Unlike WebKit, if there is neither an honored meta nor syntax resembling
an XML declaration, detection from content takes place (as in Blink).
* Unlike Blink, if there is neither an honored meta nor syntax resembling
an XML declaration, the detection from content is not dependent of network
buffer boundaries.
* Unlike Blink, detection from content can trigger a reload at the end of
the stream if the guess made at that point differs from the first guess.
(See below for the definition of the input to the first guess.)
Differences from the old spec and Gecko previously:
* Meta inside script and RCDATA elements is no longer honored.
* Late meta is now ignored and no longer triggers a reload.
* Later meta counts as early enough meta: In addition to the previous
meta within the first 1024 bytes, now a meta that started within the first
1024 bytes counts as early enough. Additionally, if by then there hasn't
been a template start tag and head hasn't ended, meta occurring before the
earlier of the end of the head or a template start tag counts as early
enough.
* Meta now counts as not-late even if the encoding label has numeric
character reference escapes.
* Syntax resembling an XML declaration longer than a kilobyte is honored if
there is no honored meta.
* If there is neither an honored meta nor syntax resembling an XML declaration,
the initial chardetng scan is potentially longer than before: the first 1024
bytes, the token spanning the 1024-byte boundary if there is such a token,
and, if by then head hasn't ended and there hasn't been a template start tag
until the end of the template start tag or the end of the token that causes
head to end, ever comes first. However, if the token implying the end of the
head is a text token, bytes only to the end of the previous non-text token is
considered. (This definition avoids depending on network buffer boundaries.)
* XML View Source now uses the code for syntax resembling an XML declaration
instead of expat for extracting the internal encoding label.
Reftest are added as both WPT and Gecko reftests in order to test both http:
and file: URL scenarios. The Gecko tests retain the WPT <link> tags in order
to use the exact same bytes.
An encoding declaration has been added to a number of old tests that didn't
intend to test the new speculation behavior especially in the context of
https://bugzilla.mozilla.org/show_bug.cgi?id=1727750 .
Differential Revision: https://phabricator.services.mozilla.com/D125808
<link media> applies to both <link rel="stylesheet"> (see
HTMLLinkElement::GetStyleSheetInfo) and all link rel="preload" links,
regardless of as value (see HTMLLinkElement::CheckPreloadAttrs), so pass it
down and check them for all of those cases.
Note that in the <link rel="stylesheet"> case we'd still have to load it, but
it doesn't block rendering and we defer its loading until more important
stylesheets are done (see SheetLoadData::ShouldDefer() which returns false if
the media attribute didn't match). So speculatively loading it seems
counter-productive.
Differential Revision: https://phabricator.services.mozilla.com/D103565
For custom element reaction invocation in the parser, we need a way to distinguish the tree appending operation is from fragments or not,
since we don't want to execute reactions until innerHTML finishes running.
(See spec changes https://github.com/whatwg/html/issues/4025)
We don't need to do anything for opAppendText and opAppendCommand since the text and command won't have any chance to
be a custom element.
Differential Revision: https://phabricator.services.mozilla.com/D10226
I guess in order to make this 100% sound we should check the whole
template mode stack, but that seemed more expensive than what I'd really
like, and I think it's not likely to be an issue in practice (maybe we
can too-eagerly preload some images inside tables inside templates, or
something of that sort?).
Differential Revision: https://phabricator.services.mozilla.com/D92773
I guess in order to make this 100% sound we should check the whole
template mode stack, but that seemed more expensive than what I'd really
like, and I think it's not likely to be an issue in practice (maybe we
can too-eagerly preload some images inside tables inside templates, or
something of that sort?).
Differential Revision: https://phabricator.services.mozilla.com/D92773
Unlike other engine vendors, we process meta elements
at parser, instead of when they are inserted. This
leads some web compact issues.
This patch aligns us with other vendors.
Differential Revision: https://phabricator.services.mozilla.com/D84545
Consider the case of a very big <style> element, with a few imports on top,
which we cut half-way over the network.
The @import scanner would be likely to have found anything there is to be found,
but we won't process it until we pop the <style> element. It's relatively low
effort to support this use-case by making Scan() return the already-found urls.
Differential Revision: https://phabricator.services.mozilla.com/D47914
--HG--
extra : moz-landing-system : lando
We don't bother handling the nested element case amazingly. We'd instead stop
at the inner <style> element and drop the URLs from the outer.
But I think that's ok. Any good way to test this? I've verified it does the
right thing looking at the CSS loader logs, but... :)
Differential Revision: https://phabricator.services.mozilla.com/D47471
--HG--
extra : moz-landing-system : lando
We don't bother handling the nested element case amazingly. We'd instead stop
at the inner <style> element and drop the URLs from the outer.
But I think that's ok. Any good way to test this? I've verified it does the
right thing looking at the CSS loader logs, but... :)
Differential Revision: https://phabricator.services.mozilla.com/D47471
--HG--
extra : moz-landing-system : lando
The session restore page keeps its restore list within a text input field
so that the values are persisted even if the page is refreshed. When form
elements were loaded with the prototype cache we didn't call
DoneCreatingElement after creating the element, which means the form values
weren't restored.
The list of elements that require DoneCreatingElement and DoneAddingChildren
to be called was in three (now four) different places, so I moved them to
a central spot in nsIContent to share in all locations. This also highlighted
that the check for <output> nodes is missing from the XML content sink.
Differential Revision: https://phabricator.services.mozilla.com/D44866
--HG--
extra : moz-landing-system : lando
The session restore page keeps its restore list within a text input field
so that the values are persisted even if the page is refreshed. When form
elements were loaded with the prototype cache we didn't call
DoneCreatingElement after creating the element, which means the form values
weren't restored.
The list of elements that require DoneCreatingElement and DoneAddingChildren
to be called was in three (now four) different places, so I moved them to
a central spot in nsIContent to share in all locations. This also highlighted
that the check for <output> nodes is missing from the XML content sink.
Differential Revision: https://phabricator.services.mozilla.com/D44866
--HG--
extra : moz-landing-system : lando
Looks like some users use it, and it's not too much effort to support. This is
somewhat simpler, and IMO better than what existed before bug 1514655 because:
* It doesn't regress bidi rendering when the pref is disabled (before, the pref
would prevent plaintext.css from applying altogether).
* It's consistent with the way view-source docs work.
* It doesn't use non-standard stylesheet APIs to toggle the stylesheet
(bug 1260720).
Differential Revision: https://phabricator.services.mozilla.com/D37742
--HG--
extra : moz-landing-system : lando
Looks like some users use it, and it's not too much effort to support. This is
somewhat simpler, and IMO better than what existed before bug 1514655 because:
* It doesn't regress bidi rendering when the pref is disabled (before, the pref
would prevent plaintext.css from applying altogether).
* It's consistent with the way view-source docs work.
* It doesn't use non-standard stylesheet APIs to toggle the stylesheet
(bug 1260720).
Differential Revision: https://phabricator.services.mozilla.com/D37742
--HG--
extra : moz-landing-system : lando
A lot of files include `nsIPresShell.h` even though currently they don't
need it. This patch removes the unnecessary inclusions.
Differential Revision: https://phabricator.services.mozilla.com/D25744
--HG--
extra : moz-landing-system : lando
A lot of files include `nsIPresShell.h` even though currently they don't
need it. This patch removes the unnecessary inclusions.
Differential Revision: https://phabricator.services.mozilla.com/D25744
--HG--
extra : moz-landing-system : lando
