问题
Is there a way to force to iPhone’s Safari to use media="handheld" in place of media="screen"?
回答1:
You can't. Safari intentionally disregards media=handheld, as such stylesheets were typically tailored to pre-iPhone handhelds with much lower capabilities, and would therefore result in a poor low-quality version of the page.
However, you can direct Safari to use specific stylesheets using conditional css.
来源：https://stackoverflow.com/questions/2123091/how-can-i-force-iphone-s-safari-to-use-media-handheld