Arbitrary text may contain characters with special meaning in HTML, which may
cause HTML display to be corrupted if they are included unescaped in a web
page. This function escapes those special characters so they do not
interfere with the HTML markup generated by e.g.
x, but with "<", ">", "&", "'", and "\"" characters replaced by
their HTML entity codes, and Encoding set to UTF-8.
 "day > night"  "<SPAN>hello world</SPAN>"
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