max_image_width

Maximum viewable (usable) width of an image expressed in logical or CSS pixels. This capability refers to the image when used in “mobile mode”, i.e. when the page is served as XHTML MP, or it uses meta-tags such as “viewport”, “handheldfriendly”, “mobileoptimised” to disable “web rendering” and force a mobile user-experience. For example, iPhone 4 can render picture 640 pixel wide, but normally, pages are served assuming a 320 pixel wide screen.