Escapes a string converting HTML special characters.

htmlEscape( string, [output] )
string The string to be converted.
output A stream where to place the output.
ReturnA converted string, or nil if writing to a string.

This function converts special HTML characters to HTML sequences:

If an output stream is specified, then the output is sent there instead being returned in a new string. If the output of this function must be sent directly to output, a true value can be passed to send data directly to the VM output stream (usually linked with web server data stream). This will spare memory and CPU.

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