Safari is blocking any call to window.open() which is made inside an async call.

The solution that I found to this problem is to call window.open before making an asnyc call and set the location when the promise resolves.

var windowReference = window.open();

myService.getUrl().then(function(url) {
     windowReference.location = url;
});

It looks to me like you're calling window.open indirectly, not in direct response to a user event. Most browsers will block those calls (I'm surprised Chrome isn't, but I don't know a lot basically anything about canvas rendering).

You may have to break up your logic into two buttons: One that generates the data: URI, then another that opens it as a new window, so that you can do the window.open in direct response to a user click.

If I do that, it works for me on Safari on the iPhone 5:

<input type="button" value="Click Me">

and

document.querySelector("input").onclick = function() {
    var uri = "data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7";
    window.open(uri);
};

You should be using some kind of custom made popups and dialogue like

1. http://umairj.com/27/how-to-create-simple-modal-dialogue-using-jquery/

2. http://www.jquery4u.com/windows/14-jquery-modal-dialog-boxes/

If you simply use the open command, Safari will open your URL in a new tab or new window, depending on the end user's preferences. You can test different experiences in Safari by opening Settings > Tabs and playing with the options for opening pages in tabs instead of windows.

AppleScript and osascript are your only options to control whether Safari opens URLs in new tabs or new windows, and Apple still very much supports them. (I wouldn't put much stock in someone's speculation that AppleScript is going away without solid supporting evidence, which can only come from Apple.) This isn't something you can do with bash alone.

This will open a new tab in the front window of Safari with your URL or open a new Safari window if one doesn't exist:

#!/bin/zsh

/usr/bin/osascript -e 'tell application "Safari" to get front document'

if [[ "$?" -eq 0 ]]; then
    # open URL in new tab of a Safari window if one exists
    /usr/bin/osascript -e 'tell application "Safari" to make new tab with properties {URL: "https://www.apple.com"} at front window'
else
    # open URL in new Safari window
    /usr/bin/osascript -e 'tell application "Safari" to make new document with properties {URL: "https://www.apple.com"}'
fi

You can use the second osascript command by itself to always open your URL in a new Safari window.

You don't want to use open -n because that literally opens a new Safari application rather than using the one that's currently running. When you do this, you'll notice two instances of Safari running in your dock or app switcher.

There are two ways to solve the problem: Note: "window.opener" is not supported by IE if "showModalDialog" is been used.

1) Instead of "window.showModalDialog" use "window.open"

2) If you want to use "window.showModalDialog" then do the following:

<script language="javascript" type="text/javascript">
    function YourFunction()
    {
        var opener = null;

        if (window.dialogArguments) // Internet Explorer supports window.dialogArguments
        { 
            opener = window.dialogArguments;
        } 
        else // Firefox, Safari, Google Chrome and Opera supports window.opener
        {        
            if (window.opener) 
            {
                opener = window.opener;
            }
        }       
        // write you code and refer "opener"
        window.close();
    }
</script>