Method 1

The following displays the Caution icon and the word 'Caution:'. You can follow this with whatever text/images/markup you like.

{{Caution}} Here is my ''Caution'' message.

Caution: Here is my Caution message.

Method 2

The following includes the text passed to the template, and uses a table to stop the text flowing round the icon.

{{Caution|1=Here is a long ''Caution'' message, which is sufficiently wordy to run onto a second line on most common screen resolutions, which would normally cause it to wrap round the icon, but because we passed it as a parameter it keeps its left alignment straight.}}

Caution:

Here is a long caution message, which is sufficiently wordy to run onto a second line on most common screen resolutions, which would normally cause it to wrap round the icon, but because we passed it as a parameter it keeps its left alignment straight.