FWIW, entities are the special characters between & and ; - and nbsp is non-breaking space, often used to get particular layouts. It really should be supported, and even not knowing an entity should not stop a page from displaying; it's like an unknown glyph in a font. Probably the most common html entity is that for ampersand itself, but they're often used for unusual letters like едц. I think most browsers fall back to showing the entire entity as text when they don't recognize them.
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