W3School TIY Editor
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<html> <head> <script type="text/javascript"> txtsize=0 maxsize=100 function writemsg() { if (txtsize<maxsize) { document.getElementById('msg').style.fontSize=txtsize txtsize++ timer=setTimeout("writemsg()",10) } } function stoptimer() { clearTimeout(timer) } </script> </head> <body onload="writemsg()" onunload="stoptimer()"> <p id="msg">W3School.org.cn!</p> </body> </html>