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One of FX SDK team requirements is to have HTML templates for generating HTML output to launch Applet/WS.
After the resolution of issue https://netbeans.org/bugzilla/show_bug.cgi?id=203224 this issue can be considered obsolete. JavaFX HTML templates are supported now in the following sense: users can create arbitrary HTML template file containing FX specific tags, to be selected in NetBeans FX Project Properties. If such template is selected, it is passed to FX deployment task which replaces tags in it and stores the output in dist subdirectory. The processed HTML is then also used for Run in Browser.