* Move as much as possible to the CSS in the template.
* Ensure that all the HTML-based templates (including epub)
contain the CSS for columns.
* Columns default to 50% width unless they are given a width
attribute.
Closes#4028.
The line identifiers are built using the code block's identifier
as a prefix. If the code block has null identifier, we use
"cb1", "cb2", etc.
Closes#4031.
This prevents the problem with extra space around highlighted
code blocks (closes#3996).
Note that we no longer put an enclosing div around highlighted
code blocks. The pre is the outer element, just as for unhighlighted
blocks.
The structure expected is:
<div class="columns">
<div class="column" width="40%">
contents...
</div>
<div class="column" width="60%">
contents...
</div>
</div>
Support has been added for beamer and all HTML slide formats.
Closes#1710.
Note: later we could add a more elegant way to create
this structure in Markdown than to use raw HTML div elements.
This would come for free with a "native div syntax" (#168).
Or we could devise something specific to slides
We now issue `<div class="line-block">` and include a
default definition for `line-block` in the default
templates, instead of hard-coding a `style` on the
div.
Closes#1623.
All templates now include `code{white-space: pre-wrap}`
and CSS for `q` if `--html-q-tags` is used.
Previously some templates had `pre` and others `pre-wrap`;
the `q` styles were only sometimes included.
See #3485.
Polyglot markup is HTML5 that is also valid XHTML. See
<https://www.w3.org/TR/html-polyglot>. With this change, pandoc's
html5 writer creates HTML that is both valid HTML5 and valid XHTML.
See jgm/pandoc-templates#237 for prior discussion.
* Add xml namespace to `<html>` element.
* Make all `<meta>` elements self closing.
See <https://www.w3.org/TR/html-polyglot/#empty-elements>.
* Add `xml:lang` attribute on `<html>` element, defaulting to blank, and
always include `lang` attribute, even when blank. See
<https://www.w3.org/TR/html-polyglot/#language-attributes>.
* Update test files for template changes.
The key justification for having language values default to blank: it
turns out the HTML5 spec requires it (as I read it). Under
[the HTML5 spec, section "3.2.5.3. The lang and xml:lang
attributes"](https://www.w3.org/TR/html/dom.html#the-lang-and-xmllang-attributes),
providing attributes with blank contents both:
* Has meaning, "unknown", and
* Is a MUST (written as "must") if a language value is not provided ...
> The lang attribute (in no namespace) specifies the primary language
> for the element's contents and for any of the element's attributes that
> contain text. Its value must be a valid BCP 47 language tag, or the
> empty string. Setting the attribute to the empty string indicates that
> the primary language is unknown.
In short, it seems that where a language value is not provided then a
blank value MUST be provided for Polyglot Markup conformance, because
the HTML5 spec stipulates a "must". So although the Polyglot Markup spec
is unclear on this issue it would seem that if it was correctly written,
it would therefore require blank attributes.
Further justifications are found at
https://github.com/jgm/pandoc-templates/issues/237#issuecomment-275584181
(but the HTML5 spec justification given above would seem to be the
clincher).
In addition to having lang-values-default-to-blank I recommend that, when an
author does not provide a lang value, then upon on pandoc command execution
a warning message like the following be provided:
> Polyglot markup stipulates that 'The root element SHOULD always specify
> the language'. It is therefore recommended you specify a language value in
> your source document. See
> <https://www.w3.org/International/articles/language-tags/> for valid
> language values.
