|To Comment Out A Block|
Mark a block of code and click the Comment button (or press CTRL+E, C) to comment out the block.
|To Uncomment A Block|
Click the Uncomment button on the Text Editor Toolbar (or press CTRL+E, U).
Commented blocks in Ruby source files are marked by inserting comment characters # at the start of each line.
In Rails template files, HTML comment delimiters are used: <!--and -->.
The Code Editor