Triple-stash & HTML tags in string #446

Hi, I have a piece of json data, which contains html tags as string:

{"key" : "<p>this is the data</p><br><ul><li>This is the list-item</li></ul>"}

I use handlebars to get the data. The ideal output should be:

This is the data

• This is the list-item

I used {{key}} at first, but the output contains the html tags as plain text:

<p>this is the data</p><br><ul><li>This is the list-item</li></ul>

In the end, the triple stash {{{key}}} helped me solve the problem and achieved the ideal output. However, I have no idea why it works. Could someone please explain the reason behind to me? Thank you in advance.