. Cases like\n        //  are handled correctly in the attribute branch\n        // below.\n        html += s + (isCommentBinding ? commentMarker : nodeMarker);\n      } else {\n        // For attributes we use just a marker sentinel, and also append a\n        // $lit$ suffix to the name to opt-out of attribute-specific parsing\n        // that IE and Edge do for style and certain SVG attributes.\n        html += s.substr(0, attributeMatch.index) + attributeMatch[1] +\n            attributeMatch[2] + boundAttributeSuffix + attributeMatch[3] +\n            marker;\n      }\n    }\n    html += this.strings[l];\n    return html;\n  }\n\n  getTemplateElement(): HTMLTemplateElement {\n    const template = document.createElement('template');\n    let value = this.getHTML();\n    if (policy !== undefined) {\n      // this is secure because `this.strings` is a TemplateStringsArray.\n      // TODO: validate this when\n      // https://github.com/tc39/proposal-array-is-template-object is\n      // implemented.\n      value = policy.createHTML(value) as unknown as string;\n    }\n    template.innerHTML = value;\n    return template;\n  }\n}\n\n/**\n * A TemplateResult for SVG fragments.\n *\n * This class wraps HTML in an `