User:Timeshifter/Sandbox197
Changes start from the bottom. Latest change is on top. Search and highlight all instances of id=
First I changed the heading a couple times. No duplicate IDs showed up. Then I created an anchor to an old heading. Then I changed the heading again.
A duplicate ID shows up only when I change back to an old heading. This is a rare event. Maybe Mediawiki could automatically remove that duplicate ID:
Basic Format. Test 1 <span class="anchor" id="Basic format. Test 1"></span>
Page source after 2nd heading change from "Basic Format" to "Basic Format. Test 1". Note the duplicate ID.
Basic Format. Test 1 [edit | edit source]
Page source when heading was "Basic Format". After adding anchor to previous name:
Basic Format [edit | edit source]
Page source after changing back from "Basic Format. Test 1" to "Basic Format":
Basic Format[edit | edit source]
Page source after heading change from "Basic Format" to "Basic Format. Test 1":
Basic Format. Test 1[edit | edit source]
Initial page source when heading was "Basic Format":