getTemplateElement() {
        const template = super.getTemplateElement();
        const content = template.content;
        const svgElement = content.firstChild;
        content.removeChild(svgElement);
        Object(_dom_js__WEBPACK_IMPORTED_MODULE_0__["reparentNodes"])(content, svgElement.firstChild);
        return template;
    }
A TemplateResult for SVG fragments.

This class wraps HTML in an `<svg>` tag in order to parse its contents in the
SVG namespace, then modifies the template to remove the `<svg>` tag so that
clones only container the original fragment.