I've run into an issue rendering some HTML/JS charts in the WebView.
 
Here is the page I am testing with:
http://d20pro.com/cfi/testRemote.html
 
It loads fine in FireFox and I also installed WebKit/Safari and tested it works in that browser. However when loading this page with WebEngine, only some of the chart renders and the console is spammed with these two runtime exceptions:
java.lang.IllegalArgumentException: dash lengths all zero
          at com.sun.prism.BasicStroke.set(BasicStroke.java:123)
          at com.sun.prism.BasicStroke.<init>(BasicStroke.java:58)
          at com.sun.javafx.webkit.prism.WCStrokeImpl.getPlatformStroke(WCStrokeImpl.java:36)
          at com.sun.javafx.webkit.prism.WCGraphicsPrismContext$15.doPaint(WCGraphicsPrismContext.java:1481)
          at com.sun.javafx.webkit.prism.WCGraphicsPrismContext$Composite.paint(WCGraphicsPrismContext.java:1288)
          at com.sun.javafx.webkit.prism.WCGraphicsPrismContext$Composite.paint(WCGraphicsPrismContext.java:1273)
          at com.sun.javafx.webkit.prism.WCGraphicsPrismContext.strokePath(WCGraphicsPrismContext.java:1478)
          at com.sun.webkit.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:260)
          at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:74)
          at com.sun.webkit.WebPage.paint2GC(WebPage.java:738)
          at com.sun.webkit.WebPage.paint(WebPage.java:705)
          at com.sun.javafx.sg.prism.NGWebView.renderContent(NGWebView.java:70)
          ...
java.lang.IllegalStateException: Unbalanced saveState/restoreState
          at com.sun.javafx.webkit.prism.WCGraphicsPrismContext.dispose(WCGraphicsPrismContext.java:1545)
          at com.sun.javafx.webkit.prism.WCPageBackBufferImpl.disposeGraphics(WCPageBackBufferImpl.java:33)
          at com.sun.webkit.WebPage.paint(WebPage.java:707)
          at com.sun.javafx.sg.prism.NGWebView.renderContent(NGWebView.java:70)
          ...
 
The AMCharts library seems to work fine with the WebView in general, as demonstrated by this URL: http://www.amcharts.com/javascript-products/
 
The testRemote.html is structured in a different way, with the chart inside a form. There isn't anything wrong with the HTML or JavaScript on this page though (as far as my team can tell). Could it be a corner-case bug in Prism?