[dwig]

Originally Posted by mmat1

Thanks for clarification, I wasn't quite shure.

... and I use it withing headings often ...

Support for it in headings seems to be a bit mixed. I did a quick experiment using <H1> heading. Using <small> worked in Sigil and ADE (Windows). Using <span class="small"> also worked in both when I had this in my CSS:

.small {
  font-size: 75%;
  }

When converted to MOBI using KindleGen (via Kindle Previewer 2), <small> worked on both the MOBI (display matched in Previewer & on a K3) and KF8 (tested in Previewer only) partitions although the size change in the MOBI portion was very slight. The <span class="small"> version worked on both partions with a larger size change.

When converted to MOBI using calibre 0.8.3 neither method worked, although the span method worked, with a much larger size change, when the CSS was:

.small {
  font-size: x-small;
  }

This 3rd version also worked Sigil and ADE/Win and with the KindleGen conversion. Perhaps the first <span> method may have worked in the calibre conversion if the size change had been larger; I didn't take the test that far.