为什么做完第一个任务以后没反应呢？如何标记完成了

[Kidsunny]

Challenge Say Hello to HTML Element has an issue.
User Agent is: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36.
Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

<h1>Hellow World</h1>

[huluoyang]

Hello World 而不是 Hellow World。