Google's (goog) mobile operating platform now accounts for 26% of Web usage -- up 35% year over year -- as measured by visits to the sites of Netapplication's 40,000 clients.
Apple's (aapl) iOS, meanwhile, suffered is own hiccup earlier this year, dropping 5.6 percentage points in February only to rebound 6.5 points in March.
Netapplications doesn't offer an explanation for either anomaly, and there may not be one beyond random statistical noise.
Bottom line: Although down 6.6% from last year, the iPhone and iPad still account for 59% of Web activity -- more than you might expect given Android's dominant share of the smartphone market (now at roughly 64%, according to Kantar) and its growing presence in tablets.
In other words, Android Web use is not keeping up with the platform's growth.