[Jellby]

Originally Posted by crutledge

<a id="CH_1"></a>
<h2>CHAPTER 1.</h2>

or

<h2 id="CH_1">CHAPTER 1.</h2>

The second is correct, the first is wrong, unless everything is wrapped in a <div>.

The reason I'm asking this is that I normally use the second format. On loading a file to Sigil, with TIDY on full, each

<h2 id="CH_#">

was changed to

<h2 id="00002">

If I remember correctly, fragment names cannot start with a digit, so the second would be wrong.