Apple’s recently-released Safari 4 web browser features a major update to its developers’ tools, and if you have anything to do with designing websites you’ll find some of these new abilities very handy. You can inspect the HTML structure of the page and alter CSS properties on the fly, profile the page load to see where you can improve things, and — best of all for Javascript programmers — it includes an excellent Javascript debugger that gives Firefox’s Firebug a run for its money. Here’s a more detailed introduction to the new tools: Review of Safari 4’s Fresh Developer Tools.