One can demonstrate JavaScript as an interpreter by typing JavaScript: into location text bar of your browser.
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This gives a two frame window where you can directly type JavaScript and see response
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One can use a similar capability in HREF and other atrribute definitions
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<a href="javascript:history.go(-1)">Go Back One Step</a>
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This loads the last page visited in being clicked
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Using history.go(0) would reload current page
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The JavaScript Manual describes some interesting Image Map Examples including:
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<MAP name="buttonbar">
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<AREA shape="rect" coords="0,0,16,14"
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HREF="javascript:top.dosomething();
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top.frames[1].location='URLtobeloadedintoanotherframe.html';" >
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</MAP>
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