Epson TM-T88V-i User Manual page 104

Example
To draw thin vertical lines at 100 dots and 200 dots from the left end:
<script type="text/javascript" src="epos-print-3.x.x.js"></script>
<script type="text/javascript">
<!--
function buildMessage() {
var builder = new epson.ePOSBuilder();
builder.addVLineBegin(100).addVLineBegin(200);
builder.addFeedUnit(100);
builder.addVLineEnd(100).addVLineEnd(200);
}
//-->
</script>
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