If I rotate my device (Nexus 5) from portrait to landscape and back to portrait, many pages will not occupy the full page width.
My user agent string is Mozilla/5.0 (Linux; Android 4.4.4; Nexus 5 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.141 Mobile Safari/537.36.
{F175972}