What platform and Sigil version are you using?
Have you tried without the unneeded xmlns attribute? That attribute is typically set on the html tag and then inherited and is not needed or included when Sigil itself generates the split marker. And from the regex would make that split marker undetectable.
Try removing the xmlns attribute with a search and replace leaving just the one on the html tag itself.
xmlns="http://www.w3.org/1999/xhtml"
Last edited by KevinH; 08-23-2020 at 10:25 AM.
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