Hello Bryce,
Maybe this is not an easy to answer question. That is, what HTML Compiler uses is the latest available WebBrowser component of Microsoft Windows, setting the "emulate" option to be Internet Explorer 11. But, if I am not wrong, we can't say an specific version of Javascript which is used by this browser, because probably support various of them in various ways.
Do you have some specific problem Bryce?Everybody can read the DecSoft support forum for learning purposes, however only DecSoft customers can post new threads. Purchase one or more licenses of some DecSoft products in order to give this and other benefits.
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