HTMLTemplateElement does not parse content

[carson-katri]

When parsing with DOMParser in JS, any HTMLTemplateElement discards its content.

<template>hello, world</template>

After parsing, when calling get_content on this element a fresh DocumentFragment is created instead of returning the DocumentFragment with the hello, world text node.

browser/src/browser/html/elements.zig

Lines 1209 to 1217 in fb6fbff

	pub fn get_content(self: *parser.Template, page: *Page) !*parser.DocumentFragment {
	const state = try page.getOrCreateNodeState(@ptrCast(@alignCast(self)));
	if (state.template_content) |tc| {
	return tc;
	}
	const tc = try parser.documentCreateDocumentFragment(@ptrCast(page.window.document));
	state.template_content = tc;
	return tc;
	}

I'm not sure if the parser needs to setup the node state, or get_content needs to be adjusted to pull the content from the correct place.