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Using jQuery.byteLimit with callback can go into a endless loop, when the text returned by the callback is longer than the maximum.

Use the following command and type some text into the input:
$( '<input />' ).appendTo( '#firstHeading' ).byteLimit( 5, function( text ) { return 'longText'+text; } );

Maybe you have to load the byteLimit function before, use this command:
mw.loader.load('jquery.byteLimit');