Style source code with line numbers

Tab size = 8 spaces

Fixed width for line numbers

• Line 1
• Line 2
• Line 3
• Line 4
• Tab-indented Line 5
• Tab-indented Line 6

Since the <ul> is set to white-space:pre;, the <li>-elements must not be indented.

Copy/paste test area

Automatic width for Line numbers

But copy/paste inserts extra white space

• Line 1
• Line 2
• Line 3
• Line 4
• Tab-indented Line 5
• Tab-indented Line 6