Show HN: AcrossTabs – Easy communication between cross-origin browser tabs

Looks like a nice library, though using a default of `*` for Origin seems like an invitation for people to shoot themselves in the foot.

I was puzzled when I first saw cross tab communication in impress.js for their slide control tab (slid.es) and I am still wondering about the proper use case of this feature today. Isn't this a security nightmare?

I think I understand what this does, but I don't think I understand the use case. Does anyone have any real-world examples of where this helps?

Chrome and Firefox support BroadcastChannel<p><a href="https:&#x2F;&#x2F;developers.google.com&#x2F;web&#x2F;updates&#x2F;2016&#x2F;09&#x2F;broadcastchannel" rel="nofollow">https:&#x2F;&#x2F;developers.google.com&#x2F;web&#x2F;updates&#x2F;2016&#x2F;09&#x2F;broadcastc...</a><p><a href="https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;docs&#x2F;Web&#x2F;API&#x2F;BroadcastChannel" rel="nofollow">https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;docs&#x2F;Web&#x2F;API&#x2F;BroadcastCh...</a>

This is great. I found this pattern very useful when communicating with iframes. I wrote a similar library a while back.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;taylorhakes&#x2F;postmessage-plus" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;taylorhakes&#x2F;postmessage-plus</a>

I had something very similar to this in my backlog, as a weekend project. Glad to see someone else beat me to it - saves me time in both implementation and maintenance! I look forward to trying it out