[wp-trac] [WordPress Trac] #30727: Right Arrow ">" At Beginning of Line (For Markdown Quote) is Replaced when Switching Editors

[WordPress Trac]

#30727: Right Arrow ">" At Beginning of Line (For Markdown Quote) is Replaced when
Switching Editors
--------------------------+------------------------------
 Reporter:  Kelderic      |       Owner:
     Type:  defect (bug)  |      Status:  reopened
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:
 Severity:  minor         |  Resolution:
 Keywords:  has-patch     |     Focuses:
--------------------------+------------------------------

Comment (by azaozz):

 Replying to [comment:12 Kelderic]:
 > If a right arrow is the first character of a line, it can't be part of
 an HTML element, and the same could be said of right arrows with spaces in
 front.

 [http://www.w3.org/TR/html5/infrastructure.html#space-character Space
 characters] (including new line U+000A and space U+0020) are allowed
 before `>` in start and end HTML tags: http://www.w3.org/TR/html-
 markup/syntax.html#syntax-start-tags and
 http://www.w3.org/TR/html5/syntax.html#syntax-start-tag.

 These are all valid HTML:

 {{{
 <p
 id="some"
 >
 }}}

 {{{
 <p id="some" >
 }}}

 {{{
 </p
 >
 }}}

 It's true "stray" `>` are allowed in text content, however they will trip
 many other functions that don't expect them. If it's any indication, when
 using contentEditable all browsers encode all `>` chars.

 If you're trying to implement Markdown support in TinyMCE, perhaps have a
 look at
 https://github.com/tinymce/tinymce/blob/master/js/tinymce/plugins/textpattern/plugin.js
 which converts some of the Markdown syntax to HTML on the fly.

 If you're implementing Markdown from PHP, I'd suggest replacing `\n>`
 with `\n>` before processing.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30727#comment:17>
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