Collapse adjacent and repeated inline formatting tags
Extracted Source:
<span style="font-style: italic"><span class="My Italic Style">italicised</span></span>
Result:
<em><em>italicised</em></em>
Extracted Source:
<span style="font-style: italic"><span class="My Italic Style">italicised</span></span>
Result:
<em><em>italicised</em></em>