Template:Spoiler start

 This template marks the start of spoiler content. The spoiler's end must be marked with spoiler end. A collapsible table will encompass the spoiler content.

You can replace the default SPOILER ALERT! by specifying the first template field (e.g. { {spoiler start|' 'CUSTOM TEXT HERE' '}}).

You can also keep the spoilers open by setting a value to nocollapse e.g. nocollapse=1.