Provide an option to display an icon for links that leave the domain of the website or open in a new tab or window

[rweil55]

One of the things that I do for links that leave my sites is to append the common icon of a small square with an up arrow. I do this by adding a class="hyperlink_external" to the <a tag.
Some possible solutions are:

1. When editing a hyperlink in the editor I would like an option to specify the class of the hyperlink.
2. Have the editor examine the link and set the class based on where the link is going.

I suspect getting #2 right for all cases would be a hard problem, so I would go for #1.

[talldan]

@rweil55 I hope you don't mind, but I relabeled the issue to make it more searchable.

I think it's also good to state what the problem is in the title as it provides an opportunity for others to suggest solutions.

[rweil55]

The up arrow typically means that you are leaving the domain of the web site. I have not seen any symbolization for the new tab/window option.

[rweil55]

I prefer the original title as it provides a more general solution. There are other attributes of a link that can be controlled by the class attribute.
If you just specify an icon, which one would be the default and how would one go about changing it?
I also might want to use a different icon for different domains