I'm wondering if there is a possibility to show to a user a cross-tab message (send it rather to a browser than a specific site). The thing is:
- user opens site X
- user opens a new tab with site Y (and stays there)
- site X has an important message for user that should be red immediately
- message box has shown on tab with site Y but comes from site X
How to achieve that? Will that work for all browsers?