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Returns the length of the content, which is treated as text/plain.
There are <strlen>foo bar gazonk</strlen> characters inside the tag.
|There are 14 characters inside the tag.|
See also the <elements> tag for use with non-string types.
Compatibility note: Before 5.0, this tag HTML encoded values from variable entities in the content. If you e.g. had the single character < in the variable var.a then <strlen>&var.a;</strlen> would produce 4 instead of 1 because it converted the < to < first. That no longer occurs, which makes this tag consistent with e.g. <if sizeof> and the sizeof() expression operator. The old behavior is retained if the compatibility level is 4.5 or less.