Even, if the HTML 4.01 Strict DTD contains a limited set of HTML elements and attributes in comparison to the HTML 4.01 Transitional DTD, it still contains a lot of elements and attributes which are not supported by all well known web browsers in mobile devices. Therefore, it could be an advantage for you to use only such a DTD that comprises only these elements supported by all browsers.
If you create your web pages with a web editor that allows to select the appropriate DTD then you should use a DTD that comprises only the elements supported. Otherwise, you need always to check or remember which elements and attributes are valid.
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