Log to Safari JavaScript Console

Make sure you have "All" selected in the top right corner of the dev tools.

If it's set to "Error" then your Safari will only show console.error().

It works just the same in Safari as it does in Chrome and Firefox. By default the developer tools is not turned on, so make sure you go to Preferences -> Advanced -> Show Develop Menu in Menu Bar. Then you can pull up the console with Command+Option+C. (That shortcut obviously assumes Mac, not sure the PC shortcut, but it's in the dropdown as well)

You can use the same console object described in that question. The messages will show up in the console tab.

console.log("hello console");

console.log will work "natively" in Firefox (with Firebug), IE8+, and WebKit browsers (including Safari).