The output of a report rendered in HTML and PDF differs because both medias are quite different. The 1st (HTML) is dedicated to displaying information on screen and the page is infinite by width and height; in contrast the 2nd format - PDF - supports physical pages and is meant not only for reading on screen but for printing.
According to whether the format supports physical pages, we separate the export formats on two groups: page-oriented (PDF, Image (print preview), print, XPS, RTF) and non-page oriented (HTML/MHTML, Excel, CSV).
For the page-oriented formats the content layout is on horizontal and vertical pages according the the page settings of the report, while for the rest of the formats take into considerations other characteristics of the media like the grid of the Excel worksheet.
That said there is no technical limitation that we're trying to work around with the current implementation but our understanding on the matter.
Anyway we will appreciate if you can share with us why do you need "physical pages" when viewing the report in the browser. I'm asking this question because our current goals are to start making the viewers more interactive thus giving the end users freedom to manipulate their reports according to their specific needs.
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