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The idea behind PDF is to be static. Think of digital sheets of paper. Code WYSIWYG as device independent as possible. The idea behind epub is to be a data container to be processed by the reading system. Code WYSIWYM with regard for limits of the reading system and individual settings. Yes there are limited functionality addons for the contrary concepts within both specs (reflow in PDF and "fixed" property in epub) but it isn't the purpose of a PDF to be dynamic or of an epub to be fixed.
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