Problem with ampersand(“&”) in anchor tags.
There is a common error occurs when including a URL which contains an ampersand ("&"):<!-- This is invalid! --> <a href="foo.cgi?chapter=1§ion=2©=3&lang=en">...</a>This example generates an error for "unknown entity section" because the "&" is assumed to begin an entity reference. Browsers often recover safely from this kind of error, but real problems do occur in some
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