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ID's allow navigation in books!
Normally (in usual books) is enough an one-way navigation, that is from Contents to the headers. (Even that isn't necessary.)
In my books is absolute essential to get an two-way navigation: there and back ... and more.
Keyword: something like <span class="return">top</span>
Last edited by chaot; 02-21-2017 at 01:46 PM.
Reason: <top>→something like <span class="return">top</span>
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