[manifest] A way to link to related applications (#326)

It would be nice if there was a way for web apps to indicate that there is an equivalent native app - by providing a link to an application store or marketplace. 

Apple, for instance, provides "[app banners](https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/PromotingAppswithAppBanners/PromotingAppswithAppBanners.html)": 

```HTML
<meta name="apple-itunes-app" content="app-id=myAppStoreID, affiliate-data=myAffiliateData, app-argument=myURL">
``` 

And Microsoft has the following [meta tags](https://msdn.microsoft.com/en-us/library/ie/hh781489%28v=vs.85%29.aspx):

```HTML
<meta name="msApplication-ID"content="microsoft.build.App"/>
<meta name="msApplication-PackageFamilyName"content="microsoft.build_8wekyb3d8bbwe"/>
```
Such a feature could help with the "door slam" problem. 


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Reply to this email directly or view it on GitHub:
https://github.com/w3c/manifest/issues/326