STR:

1. Go to https://davidwalsh.name/
2. Open main.js, click line 1 in the gutter
3. Note: the first column breakpoint shown, and the breakpoint selected, is column 49
4. Refresh the page
5. This time, there's a column breakpoint at column 0 (wasn't there before)

ER:

1. It's odd that there's no column breakpoint shown at column 0 the first time
2. Obviously if column 0 did show a breakpoint, that column breakpoint would be selected when clicking in the gutter.