"Web Intents" were deprecated in Chrome 24 (November/2011) and are no longer supported in any browser:
We also gathered a lot of valuable data and feedback from our experimental support for Web Intents and decided to disable the feature in today's Beta release.
Is there an HTML5 standard that I can look into as an alternative to what Web Intents intended? I'm interested in how web services can be stitched together. For example, imagine a website that can import a image from any number of web-services, modify the image in some way, then push the file back to any number of other web-services, all via HTML5 standards.