These work on WebVPython only
=============================

console.log()
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It is possible to output text and variable values to the JavaScript console.  In a browser press CTRL-J to open the console.

``console.log('A scalar', a+10, 'and a vector', v.toString())``

alert()
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An alert pauses execution and displays the string in a dialog box. Numeric values are converted to strings.

``alert('The mass is '+m+' kg.')``