Translations:Help:TemplateData/410/en

• In the visual editor and the 2017 wikitext editor, $1 makes the input box display an external link icon (a square with arrow pointing out of it) in the left hand side of the box and makes the box glow red when the user clicks away without entering a URL value that includes a valid Internet protocol (e.g., "$2", "$3" or "$4") followed by some text.