calibre is free, it does not need to be purchased. And most book readers, including calibre, use browsers to do the actual rendering. The calibre viewer operates by default in paged mode, which means that when you click a link you will be taken to the page that contains the target of the click, it will not neccessarily be at the top of the page. If you wish to always ensure it is at the top of a page, you need to insert a page break before the target. Or click the yellow scroll icon in th etop right corner of the viewr to switch it to flow mode and it will behave like a browser.
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