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.
The citations appear at the end of the document as a definition
list in a special div with id `citations`.
Citations link to the definitions.
Added stateCitations to ParserState.
Closes#853.
Previously we would refuse to parse anything as raw inline if
it was in the blockCommands list. Now we allow exceptions
if they're listed under ignoreInlines in inlineCommands.
This should make it easier e.g. to include an \hspace
between two side-by-side raw LaTeX tables.
Otherwise things like `\noindent foo` break and turn into
`\noindentfoo`.
Affects `-f latex+raw_tex` and `-f markdown` (and other formats
that allow `raw_tex`).
Closes#1773.
For example, in
\begin{tabular}{>{$}l<{$}>{$}l<{$} >{$}l<{$}}
each cell will be interpreted as if it has a `$`
before its content and a `$` after (math mode).
Currently the support for the `.. table` directive is a bit
limited; we don't yet support the `widths` field. But at least
you can have a proper captioned table.
These were confusing.
Now we rely on the +raw_tex or +raw_html extension with latex
or html input.
Thus, instead of
--parse-raw -f latex
we use
-f latex+raw_tex
and instead of
--parse-raw -f html
we use
-f html+raw_html
The org writer was inserting two spaces after list bullets. Emacs
Org-mode defaults to a single space, so behavior is changed to reflect
this.
Closes: #3417
