Epson TM-T88V-i User Manual page 76

Example
To set the size as double width and height:
<script type="text/javascript" src="epos-print-3.x.x.js"></script>
<script type="text/javascript">
<!--
function buildMessage() {
var builder = new epson.ePOSBuilder();
builder.addTextDouble(true, true);
}
//-->
</script>
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