Regression with svg elements

[Ihromant]

After some recent changes new issue appeared:

HTMLElement svg = HTMLDocument.current().createElementNS("http://www.w3.org/2000/svg", "svg").cast();
        svg.setAttribute("width", "10");
        HTMLDocument.current().appendChild(svg);

fails with CCE. It compiles to

var$2 = otj_JSObject_cast$static((otjdh_HTMLDocument_current()).createElementNS("http://www.w3.org/2000/svg", "svg"));
    var$3 = $rt_instanceOfOrNull(var$2, HTMLElement);
    $svg = $rt_throwCCEIfFalse(var$3, var$2);
    $svg.setAttribute("width", "10");
    (otjdh_HTMLDocument_current()).appendChild($svg);

It fails because svg is not instance of HTMLElement. I overcame it with

@JSBody(script = "return document.createElementNS('http://www.w3.org/2000/svg', 'svg');")
    private static native HTMLElement svg();

but earlier it worked well.

[konsoletyper]

This is expected behaviour. Unfortunately, previous versions of TeaVM did not behave correctly with run-time type checking in case of JSO, so you did not identify this issue on your side. The proper way would be to upcast HTMLDocument to just Document and then use it to create SVG elements. I know, standard does not re-define return value of createElement to return HTMLElement, but it looked convenient and assuming most users would work with HTML DOM and removing override to createElement is a breaking change, I won't remove it.