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approg
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The latest version of jQuery released in 2016 is version 3.1. DO you really want to use a 5+ year old of jQuery?

There’s no easy way to know what the identifier of Lectora element is. What I’ve started doing is what someone here suggested ie. add a custom CSS class name to the element (within Lectora 17) and then in my JavaScript I refer to it with

getDisplayDocument().querySelector(“.my custom CSS class name here”);

Having said that the JavaScript that Lectora uses is not well documented and not guaranteed to not change from version to version.