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-rw-r--r--README.md3
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diff --git a/README.md b/README.md
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+++ b/README.md
@@ -135,6 +135,9 @@ So tags are serialized according to these rules:
Please check the issue queue for a full list, but the following are
issues known issues that are not presently on the roadmap:
+- Namespaces: HTML5 only [supports a selected list of namespaces](http://www.w3.org/TR/html5/infrastructure.html#namespaces)
+ and they do not operate in the same way as XML namespaces. A `:` has no special
+ meaning. The parser does not support XML style namespaces via `:`.
- Scripts: This parser does not contain a JavaScript or a CSS
interpreter. While one may be supplied, not all features will be
supported.