​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Element 对象</h1>
​
<h2>isDefaultNamespace 属性</h2>
​
<p>指定的命名空间是默认的吗？</p>
​
<p id="demo"></p>
​
<script>
const element = document.documentElement;
let answer = element.isDefaultNamespace("http://www.w3.org/1999/xhtml"); 
document.getElementById("demo").innerHTML = answer;
</script>
​
</body>
</html>
​