The company advises users to install the update on all "MacBook and MacBook Pro computers and extra batteries that were purchased between February 2006 and April 2007".
Compared to previous versions of HTML, HTML5 makes it easier to create feature-rich Web-based applications that can be updated remotely with new functionality without requiring users to download and install an update each time.
More recently Toyota had to ask Prius owners to take their cars into garages to install a software update after reports some models had suffered from "inconsistent brake feel".