Script Alert - Title - Alert Box

It's a platform standard dialog, so you get what you get.

You could use scriptUI to create a subjectively better looking alert... At least it will be "more consistent" from Mac to Win.

Here is a function that can be used once, with a variable call to change the alert text multiple times if needed.

https://gist.github.com/MarshySwamp/9b23cfeb128ab6652164d6d87268bc6a

scriptAlert("Alert window title", "Alert text string 1", "Alert text string 2");

function scriptAlert(alertTitle, alertString1, alertString2) {
    var alertWindow = new Window("dialog", undefined, undefined, {resizeable: false});
        alertWindow.text = alertTitle;
        alertWindow.preferredSize.width = 300;
        alertWindow.preferredSize.height = 100;
        alertWindow.orientation = "column";
        alertWindow.alignChildren = ["center", "top"];
        alertWindow.spacing = 25;
        alertWindow.margins = 20;
    var alertText = alertWindow.add("group");
        alertText.orientation = "column";
        alertText.alignChildren = ["left", "center"];
        alertText.spacing = 0;
        alertText.alignment = ["left", "top"];
        alertStringSize1 = alertText.add("statictext", undefined, alertString1, {name: "alertText", multiline: true});
        alertStringSize1.graphics.font = ScriptUI.newFont ("dialog", "BOLD", 13);
        alertStringSize2 = alertText.add("statictext", undefined, alertString2, {name: "alertText", multiline: true});
        alertStringSize2.graphics.font = "dialog:13";
    var okButton = alertWindow.add("button", undefined, undefined, {name: "okButton"});
        okButton.text = "OK";
        okButton.alignment = ["left", "top"];
        okButton.graphics.font = "dialog:13";
    
    alertWindow.show();
}

Edit: I have updated the code to increase the size of the text so that the text size is more legible on Win OS. I'm still trying to work out the correct syntax for the menu title size... Can anybody help?

Based on code generated from ScriptUI Dialog Builder with some tweaks based on Peter Kahrel's "Bible" – Beginning ScriptUI