📄 19-1.txt
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<!-- Set a variable to determine what version of JavaScript we support. --><!-- This technique can be extended to any number of language versions. --><SCRIPT LANGUAGE="JavaScript"> var _version = 1.0; </SCRIPT><SCRIPT LANGUAGE="JavaScript1.1"> _version = 1.1; </SCRIPT><SCRIPT LANGUAGE="JavaScript1.2"> _version = 1.2; </SCRIPT><!-- Run this code on any JavaScript-enabled browser. --><!-- If the version is not high enough, display a message. --><SCRIPT LANGUAGE="JavaScript"> if (_version < 1.1) { document.write('<HR><H1>This Page Requires JavaScript 1.1</H1>'); document.write('Your JavaScript 1.0 browser cannot run this page.<HR>'); }</SCRIPT><!-- Now run the actual program only on JavaScript 1.1 browsers. --><SCRIPT LANGUAGE="JavaScript1.1"> // The actual JavaScript 1.1 code goes here.</SCRIPT>
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