Fix element.hasAttributes

libdom's hasAttributes is based on the type. Elements, according to libdom,
always have attributes, thus hasAttributes always return true, even when the
element in question has no attribute. Change our _hasAttributes to only return
true if the attribute count > 0.

src/browser/dom/element.zig

@@ -160,8 +160,14 @@ pub const Element = struct {
         }
     }
 
+    // don't use parser.nodeHasAttributes(...) because that returns true/false
+    // based on the type, e.g. a node never as attributes, an element always has
+    // attributes. But, Element.hasAttributes is supposed to return true only
+    // if the element has at least 1 attribute.
     pub fn _hasAttributes(self: *parser.Element) !bool {
-        return try parser.nodeHasAttributes(parser.elementToNode(self));
+        // an element _must_ have at least an empty attribute
+        const node_map = try parser.nodeGetAttributes(parser.elementToNode(self)) orelse unreachable;
+        return try parser.namedNodeMapGetLength(node_map) > 0;
     }
 
     pub fn _getAttribute(self: *parser.Element, qname: []const u8) !?[]const u8 {
@@ -679,4 +685,8 @@ test "Browser.DOM.Element" {
         .{ "div1.innerHTML = \"  <link/><table></table><a href='/a'>a</a><input type='checkbox'/>\"", null },
         .{ "div1.getElementsByTagName('a').length", "1" },
     }, .{});
+
+    try runner.testCases(&.{
+        .{ "document.createElement('a').hasAttributes()", "false" },
+    }, .{});
 }