Does the web site verify whether APP? is installed or not?

this is snapchat
. It will say whether you have installed
, then it is directly OPEN
. If you have it, you will download
questions. How can this technology
be implemented?

I have found that it seems to be this tag

<meta property="al:ios:url" content="https://itunes.apple.com/tw/app/id12xx" />
<meta property="al:ios:app_store_id" content="12xx" />
<meta property="al:ios:app_name" content="xxx" />
<meta property="al:iphone:url" content="https://itunes.apple.com/tw/app/id12xx" />
<meta property="al:iphone:app_store_id" content="12xx" />
<meta property="al:iphone:app_name" content="xxx" />
<meta property="al:web:url" content="https://itunes.apple.com/tw/app/id12xx" />
<meta property="al:web:should_fallback" content="false" />

but I find it doesn"t seem to work?

Web ios property javascript meta

Mar.18,2021

have not touched this online search hope can help you browser to judge whether to install APP

in the past windows ie-based era, you can judge by checking controls, but now H5, controls are not recommended, so other methods are needed.
is usually checked by special protocols, but due to the security control of browsers, the effect will not be perfect.

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