It is possible to create a new format on top of widely implemented HTML and CSS. Additional semantics (for example, formulas) can be placed inside attributes as it is done in microformats . CSS 3 allows you to implement new features (for example, callouts , footers ).
In order to show that this is possible, I and Bert Bosch published a book that was written in HTML and CSS . A significant feature of this approach is the fact that documents can be viewed in most browsers.
Source: https://habr.com/ru/post/3609/
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