docs: Add semantic highlighting

README.md

@@ -7,23 +7,30 @@ Please refer to the [WebC documentation](https://www.11ty.dev/docs/languages/web
 - [Autocomplete](#autocomplete)
 - [Documentation](#documentation)
 - [Definitions](#definitions)
+- [Semantic highlighting](#semantic-highlighting)
 
 ## Autocomplete
 
 Provides `webc:` and `@` attribute autocomplete suggestions for HTML tags.
 
-<img src="images/attribute-autocomplete-webc.webp" alt="List of autocomplete suggestions for WebC attributes." width="396">
+<img src="images/attribute-autocomplete-webc.webp" alt="List of autocomplete suggestions for WebC attributes." width="396" height="294">
 
-<img src="images/attribute-autocomplete-at.webp" alt="List of autocomplete suggestions for WebC @ attributes." width="378">
+<img src="images/attribute-autocomplete-at.webp" alt="List of autocomplete suggestions for WebC @ attributes." width="378" height="132">
 
 ## Documentation
 
-`webc:` and `@` attributes show a link to the WebC documentation on hover.
+`webc:` and `@` attributes show links to the WebC documentation on hover.
 
-<img src="images/documentation-links.webp" alt="Hover tooltip on a webc:for attribute showing a link to the WebC documentation." width="345">
+<img src="images/documentation-links.webp" alt="Hover tooltip on a webc:for attribute showing a link to the WebC documentation." width="345" height="95">
 
 ## Definitions
 
 Support for _Go to Definition_ and _Peek Definition_ ([VS Code _Peek_ documentation](https://code.visualstudio.com/docs/editor/editingevolved#_peek)) and <kbd>Ctrl</kbd> + Click on WebC component tags to go the source file.
 
-<img src="images/peek-definition.webp" alt="Peek definition disclosure box for a WebC component." width="748">
+<img src="images/peek-definition.webp" alt="Peek definition disclosure box for a WebC component." width="698" height="465">
+
+## Semantic highlighting
+
+[Semantic highlighting](https://code.visualstudio.com/docs/getstarted/themes#_editor-semantic-highlighting) for WebC component tags and keyword attributes.
+
+<img src="images/semantic-highlighting.webp" alt="Semantic highlighting example for a WebC component." width="253" height="155">