Adds GLSL syntax highlighting to inline `<script type="shader">` tags.

HTML.tmLanguage

<!-- Begin glsl -->
<dict>
  <key>begin</key>
  <string>(?:^\s+)?(&lt;)((?i:script))\b(?![^&gt;]*/&gt;)(?=.*type=["']shader(.*)?['"])</string>
  <key>beginCaptures</key>
  <dict>
    <key>1</key>
    <dict>
      <key>name</key>
      <string>punctuation.definition.tag.begin.html</string>
    </dict>
    <key>2</key>
    <dict>
      <key>name</key>
      <string>entity.name.tag.template.html</string>
    </dict>
  </dict>
  <key>end</key>
  <string>(?&lt;=&lt;/(script|SCRIPT))(&gt;)(?:\s*\n)?</string>
  <key>endCaptures</key>
  <dict>
    <key>2</key>
    <dict>
      <key>name</key>
      <string>punctuation.definition.tag.html</string>
    </dict>
  </dict>
  <key>name</key>
  <string>source.glsl.embedded.html</string>
  <key>patterns</key>
  <array>
    <dict>
      <key>include</key>
      <string>#tag-stuff</string>
    </dict>
    <dict>
      <key>begin</key>
      <string>(?&lt;!&lt;/(?:script|SCRIPT))(&gt;)</string>
      <key>captures</key>
      <dict>
        <key>1</key>
        <dict>
          <key>name</key>
          <string>punctuation.definition.tag.begin.html</string>
        </dict>
        <key>2</key>
        <dict>
          <key>name</key>
          <string>entity.name.tag.script.html</string>
        </dict>
      </dict>
      <key>end</key>
      <string>(&lt;/)((?i:script))</string>
      <key>patterns</key>
      <array>
        <dict>
          <key>include</key>
          <string>source.glsl</string>
        </dict>
      </array>
    </dict>
  </array>
</dict>
<!-- End glsl -->