Example code
<FONT SIZE="4" FACE="courier" COLOR=blue><MARQUEE WIDTH=100% BEHAVIOR=ALTERNATE BGColor=yellow>This is an example of an alternating marquee...</MARQUEE></FONT>
Result
<FONT SIZE="4" FACE="courier" COLOR=blue><MARQUEE WIDTH=100% BEHAVIOR=ALTERNATE BGColor=yellow>This is an example of an alternating marquee...</MARQUEE></FONT>
Result