Template:HD/url
URLs containing certain characters will display and link incorrectly unless those characters are encoded. For example, a space must be replaced by %20.
| sp | " | ' | , | ; | < | > | ? | [ | ] |
|---|---|---|---|---|---|---|---|---|---|
| %20 | %22 | %27 | %2c | %3b | %3c | %3e | %3f | %5b | %5d |
- Single apostrophes do not need to be encoded; multiples will be parsed as italic or bold markup
The link button 
on the enhanced editing toolbar will encode a link.
The URL must start with a supported URI scheme. http:// and https:// are always supported. gopher://, irc://, ircs://, ftp://, news:// and mailto: will create a link and an icon but require an agent registered in the browser.