Update CommonMark spec to 0.30

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [12.1.0] - WIP
+### Changed
+- Updated CM spec compatibility to 0.30.
+
+
 ## [12.0.6] - 2021-04-16
 ### Fixed
 - Newline in `alt` should be rendered, #775.
@@ -562,6 +567,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Renamed presets folder (configs -> presets).
 
 
+[12.1.0]: https://github.com/markdown-it/markdown-it/compare/12.0.6...12.1.0
 [12.0.6]: https://github.com/markdown-it/markdown-it/compare/12.0.5...12.0.6
 [12.0.5]: https://github.com/markdown-it/markdown-it/compare/12.0.4...12.0.5
 [12.0.4]: https://github.com/markdown-it/markdown-it/compare/12.0.3...12.0.4

lib/rules_block/html_block.js

@@ -10,7 +10,7 @@ var HTML_OPEN_CLOSE_TAG_RE = require('../common/html_re').HTML_OPEN_CLOSE_TAG_RE
 // last argument defines whether it can terminate a paragraph or not
 //
 var HTML_SEQUENCES = [
-  [ /^<(script|pre|style)(?=(\s|>|$))/i, /<\/(script|pre|style)>/i, true ],
+  [ /^<(script|pre|style|textarea)(?=(\s|>|$))/i, /<\/(script|pre|style|textarea)>/i, true ],
   [ /^<!--/,        /-->/,   true ],
   [ /^<\?/,         /\?>/,   true ],
   [ /^<![A-Z]/,     />/,     true ],