HTML single quotation mark, double quote escape

Today, after editing an HTML template with a TRS background, after saving and publishing, the preview of the revised page will be an error. But I just added the red code below.

<p>

<span style= "color: #ff0000;" > Content </span>

</p>

So I put the above code off and normal, the problem is in the code I added, but look at the code there is nothing wrong, so there is a look at the template other code found &apos; and &quot; code

Search the Internet to find &apos; is the escape character of single quotation mark,&quot; is the escape character of double quotation mark. I'll just follow the gourd. Change the above code to

<p>

<span style=&quot; Color: #ff0000; &quot; > Content </span>

</p>

Save the publication preview OK!

HTML single quotation mark, double quote escape