If you’ve ever been frustrated by visiting a website on your iPhone or iPad and finding it won’t work because it uses Flash, you’ll welcome the latest Google initiative: it is now flagging Flash content in its search results, warning that the site may not work on your device.

As Google notes, Android has now also abandoned Flash support due to the same reliability, security and performance concerns that Steve Jobs expressed in his famous open letter to Adobe back in 2010. Adobe has been forced to issue a succession of security updates to Flash, the most recent being two emergency updates earlier this year.

Starting today, we will indicate to searchers when our algorithms detect pages that may not work on their devices. For example, Adobe Flash is not supported on iOS devices or on Android versions 4.1 and higher, and a page whose contents are mostly Flash may be noted

Google says it hopes the move, coupled to Web Fundamentals and Web Starter Kit initiatives for developers will encourage the use of HTML5 in place of Flash.