In CSS 2.1 this was undefined.
CSS 2.1 -- 12.1 The :before and :after pseudo-elements
Note. This specification does not fully define the interaction
of :before and :after with replaced elements (such as IMG in HTML).
This will be defined in more detail in a future specification.
-- https://www.w3.org/TR/CSS21/generate.html#before-after-content
In CSS 3 the :before and :after generated content boxes are not allowed
on replaced elements.
CSS 3 Generated and Replaced Content Module
12. Replaced content
The box model defines different rules for the layout of replaced
elements than normal elements. Replaced elements do not have
'::before' and '::after' pseudo-elements; the 'content' property
in the case of replaced content replaces the entire contents of
the element's box.
-- https://www.w3.org/TR/css3-content/#replacedContent
An alternative approach which may be better would be to create the
JavaScript context when the html_content is created, rather than
on demand.
This code checks for the JS context and creates one every time we
add a node to the DOM. So when JS is on, every doc with a single
node in it has a JS context. This seems to make on-demand creation
a redundant overhead.
Now we take the value of the javascript_enabled option when the
content is created. We then use the content's script_enabled
boolean everywhere else.
This prevents us getting inconsistent values for javascript_enabled
if a user toggles the setting while a page is loading.
It was read frequently during box construction, and also the
parser's script enabled setting could change where we handled
a change of encoding.
Now we only care about the setting of the javascript_enabled
option at time of html_content creation.
Default is to display the encoded version as this provides some security making phishing domains more obvious, and a lot of our frontends are unable to display the full range of UTF-8 characters on the status bar.
Displaying the decoded address in the URL bar requires frontends to be updated (GTK and Amiga done already), and the same caveats apply.
When the fetch of asynchronous javascript scripts completed the
completion of html rendering was not processed leaving the state
machine waiting forever.
Fixed point representation couldn't store 0.65 exactly, so avoid doing
the divide by 100 first.
I will look at moving this into libcss's fixed point header and doing
it in a way that avoids arithmetic overflow, but for now this fixes
el reg layout.
This changes the LOG macro to be varadic removing the need for all
callsites to have double bracketing and allows for future improvement
on how we use the logging macros.
The callsites were changed with coccinelle and the changes checked by
hand. Compile tested for several frontends but not all.
A formatting annotation has also been added which allows the compiler
to check the parameters and types passed to the logging.
This makes the box_move_xy function return a value on all code
paths. This was not really necessary as there is an assert in the path
that could have returned without a value. The gcc optimiser seems
unable to reason about this in this case causing a warning.
The ftell call in the html renderer handling of drag and drop was not
checking its return value for errors which could have resulted in
attempting to read -1 bytes.
coverity 1251038
The html content script handling needs to invalidate its JavaScript
context when the browsing context (browser_window) containing it is
either closed or the content fetch is aborted (stopped)
Previously the invalidation was only done on browser_window close
which resulted in use after free crashes because of the now invalid
JavaScript context.
When the browser window is about to be destroyed html_close gets
called indicating the browser_window previously associated with the
html content is about to become invalid.
This makes the javascript context invalid within the html content (it
is held by the browser window) when that context is about to be
destroyed. Previously the javascript children would continue to
attempt to use the context after it had been destroyed causing all
sorts of strange errors and failures.
By hiding all but the form selection menu option structure from code
outside of render this reduces the API to the absolute minimum to
support this feature.
Update the form API so instead of directly warning the user it returns
an error code to the caller allowing the appropriate action to be
taken outside the core. Additionally clean up documentation of this
API.
Previously content handler debugging features were accessed by global
variables. This allows the setting of debugging parameters via a
content API giving per content control over debugging features.
Currently only used by the html content handler to toggle global
redraw debugging.
The frontends previously had to use an html renderer API to get the
encoding of a content. This also required the explicit checking of the
contents type rather than using the existing content API to abstract
this knowledge.
This cleans up this header and moves the functionality into more
useful places while reducing the include complexity but only pulling
in whats required.
Update the API which allows frontends to acquire the page features
(images, link urls or form elements) present at the given coordinates
within a browser window.
By making this an explicit browser_window API and using the browser.h
header for the associated data structure with a more appropriate API
naming the usage is much more obvious and contained.
Additionally the link url is now passed around as a nsurl stopping it
being converted from nsurl to text and back again several times.
The netsurf core is driven from numerous operation tables most of
which are now set through a common netsurf_register() interface. The
font and plotting interfaces are currently separate and unlike all the
other operation tables are modified for differing contexts.
This change moves the font operations alongside all the other
operations table and remove unnecessary interaction with the renderers
font internals. Further this also removes the need for css internals
to be visible in frontends.
Values returned by nscss_len2px are actually libcss fixed-points,
so convert the result to pixels. Also reduce the amount by which
the top of descendant bboxes are extended to 3/4 of the text
height, which is the maximum possible amount that the text can
protrude above the box when line-height is reduced.
