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We are designing a template for a mobile site and we got to the problem where we don’t know what size a logo should be, or the background, etc.
We will use the Jquery mobile API and HTML5 / CSS3 which basically allows us to create the whole architecture of the site without worrying about the dimensions, but in terms of external assets like backgrounds and images we don’t know what is the best size in order to be more compatible with most devices.
The iPhone 4S/5 has a high-resolution screen that’s 640 pixels wide. Many Android smartphones top out at 720px wide, although some go up to 800px. Anything over that is probably considered a tablet.
The best thing you can do as far as wide compatibility, then, is a single CSS style:
This will ensure that no matter what resolution the screen is, your images will be no larger than the element containing it. (When building a responsive site with mobile users in mind, your element widths, margins and padding should all be computed as percentages whenever possible.) Obviously it also means that you’re downloading more image data than many phones will need, but if you’re dealing with two-color logos, it’s not much of a difference. As always, keep your images as few and as small as possible.
In addition, if you’re not dealing with photos, you should look at SVG images. Since they’re vector-based, they resize perfectly at any resolution, and they’re compatible with pretty much every browser except IE8 and Android 2.x.