Is it possible to have HTML text or CDATA inside an XML attribute?

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No, The markup denoting a CDATA Section is not permitted as the value of an attribute.

According to the specification, this prohibition is indirect rather than direct. The spec says that the Attribute value must not have an open angle bracket. Open angle brackets and ampersand must be escaped. Therefore you cannot insert a CDATA section. womp womp.

A CData Section is interpreted only when it is in a text node of an element.

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