"title" is not a class, it is an attribute. In normal HTML it could, for instance, be displayed as a tooltip when you hover the mouse on the element. In ebook readers it will probably have no effect at all, but Sigil uses it to create the TOC (it cannot put an image in the TOC, but it will put whatever you write in the "title" attribute
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Originally Posted by odedta
I can't think of any reason why you want to put an image in a heading tag.
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The simplest one: when you want to have the chapter title embedded in some illustration or decorative ornament.