Rather than doing all the work myself, I'll just post Apok's dissertation which he embedded in one of the threads some time back...
Originally Posted by Apokalupsis
(and, no, the tag is not php, it's bb code...I just used the php tag to keep the spoiler tag from working in this instancePHP Code:
You can use the spoiler tag by typing [SPOILER]at the beginning of the text you need to hide and [/SPOILER] at the end of this text.
)
Even simpler, unless you are using the quick reply interface, you can hit the black button that says "text" in white letters. This button is located just above your text area when replying. You can highlight the text you want to hide, and hit the button, and it will automatically encapsulate your highlighted text with the tags, or you can hit the button first, which will create the beginning and ending tag for you, and then you can just type the text that you want to hide between the tags.
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