Common causes for this condition:
- Placing plain text in an element intended to be rendered as HTML.
Example: representing a less than sign ("<") as escaped HTML
requires the following code:
- Use of non-HTML tags.
- Arbitrary truncation of HTML, possibly in the middle of a tag.
- Unmatched quotes in attribute values, or missing whitespace between attributes
- For Atom feeds: declaring the
xhtml, but not changing the default namespace from atom's to xhtml's.
For elements intended to be rendered as HTML, like RSS
description, make sure that all plain text content is escaped
first as HTML and then again as XML.
For Atom text constructs, you can use the
to declare your intented usage: plain
html or in-line
Not clear? Disagree?
You might be able to find help in one of these fine resources.