New Window Icon (for web accessibility)

I am coming late to this party, but look what I have found at CodePen !

a[target="_blank"]::after {
  content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVR42qXKwQkAIAxDUUdxtO6/RBQkQZvSi8I/pL4BoGw/XPkh4XigPmsUgh0626AjRsgxHTkUThsG2T/sIlzdTsp52kSS1wAAAABJRU5ErkJggg==);
  margin: 0 3px 0 5px;
}

<a class="external" href="https://example.org" target="_blank">external link</a>

For many Unicode characters you'll need to use the following font (at least for Windows, please comment for Linux and Mac if you're able to test):

a:link {font-family: 'Segoe UI Symbol' !important;}

Also you can apply CSS selectors to use the target attribute as so:

a[target='blank']
a[target]

Keep in mind that browsers are funny about the behavior of the a selector and a:link / a:visited so definitely test with that in mind.

Unicode 'Two Joined Squares' character:

⧉

http://www.fileformat.info/info/unicode/char/29c9/index.htm

CSS

a[target='_blank']::after {content: '\29C9';}

Support

Mac OS X, Yosemite: 2 fonts, Apple Symbol and STIXGeneral

Unicode 'White Square with Upper Right Quadrant' character:

◳

http://www.fileformat.info/info/unicode/char/25F3/index.htm

CSS

a[target='_blank']::after {content: '\25F3';}

Support

Mac OS X, Yosemite: 3 fonts, Apple Symbol, STIXGeneral, Menlo.

Unicode 'Upper Right Drop-Shadowed White Square' character:

❐

http://www.fileformat.info/info/unicode/char/2750/index.htm

CSS

a[target='_blank']::after {content: '\2750';}

Support

Mac OS X 10.10 Yosemite has three fonts: Arial Unicode MS, Menlo and Zapf Dingbats.

I like this unicode symbol for Open-in-new-window

↗️ or ↗

North East Arrow Make sure you're using utf-8 html.

Html is ↗