From a functionality point of view, the alerts are ideally short text message and hence there was never a need to provide any functionality to display if texts were getting de-limited.
The alert box is of fixed length and can only hold that much characters which can fix in that.
There is no customization to add scrollbar to alert area. Changing .css files might be a way. But there are two workaround which are easier than modifying .CSS files.
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