Package html provides functions for escaping and unescaping HTML text.
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EscapeString escapes special characters like "<" to become "<". It escapes only five such characters: <, >, &, ' and ". UnescapeString(EscapeString(s)) == s always holds, but the converse isn't always true.
UnescapeString unescapes entities like "<" to become "<". It unescapes a larger range of entities than EscapeString escapes. For example, "á" unescapes to "á", as does "á" and "&xE1;". UnescapeString(EscapeString(s)) == s always holds, but the converse isn't always true.