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Tried to add the following YouTube link: http://www.youtube.com/watch?v=me3BviH3nZc inside a note, using the following mark-up: {{Note|[http://www.youtube.com/watch?v=me3BviH3nZc Watch Erik's entire WebGL video tutorial] for free on YouTube. Over 2 and a half hours of WebGL tuition! }} But I just got something that looked like {{{1}}} instead of my note.
The problem is the equals sign inside the URL, as this is a special character for template calls (separating parameter name and value). You'd either have to replace every = with {{=}} like this: {{Note|[http://www.youtube.com/watch?v{{=}}me3BviH3nZc Watch Erik's entire WebGL video tutorial] for free on YouTube. Over 2 and a half hours of WebGL tuition! }} or (easier for editors) prefix the note-text with 1= like this: {{Note|1=[http://www.youtube.com/watch?v=me3BviH3nZc Watch Erik's entire WebGL video tutorial] for free on YouTube. Over 2 and a half hours of WebGL tuition! }} This should probably be mentioned in the style guide or some other place.
Added the following note to http://docs.webplatform.org/wiki/WPD:Style_Guide/Gotchas: =URL containing special characters in notes or other tags= Certain links contain special characters, such as the equal sign (=) in a link to a YouTube video (for example, http://www.youtube.com/watch?v=me3BviH3nZc). When these links are inside other wiki references, such as the Note tag, the special character needs to be escaped. Two ways to do so are: * Replace every = with {{=}}, as in: <syntaxhighlight> {{Note|[http://www.youtube.com/watch?v{{=}}me3BviH3nZc Watch Erik's entire WebGL video tutorial] for free on YouTube. Over 2 and a half hours of WebGL tuition! }} </syntaxhighlight> OR * Prefix the note-text with 1=, as in: <syntaxhighlight> {{Note|1=[http://www.youtube.com/watch?v=me3BviH3nZc Watch Erik's entire WebGL video tutorial] for free on YouTube. Over 2 and a half hours of WebGL tuition! }} </syntaxhighlight>