Implement HTMLDocument.createElement

Signed-off-by: Francis Bouvier <francis.bouvier@gmail.com>

build.zig

@@ -71,6 +71,7 @@ fn common(
 }
 
 fn linkLexbor(step: *std.build.LibExeObjStep) void {
+    // cmake . -DLEXBOR_BUILD_SHARED=OFF
     const lib_path = "../lexbor/liblexbor_static.a";
     step.addObjectFile(lib_path);
     step.addIncludePath("../lexbor/source");