* What is NodeRectViewer? [5] It displays boxes (e.g. padding box, border box, and so on) displayed within your browser. Execute the bookmarklet below and see what occurs. * NodeRectViewer bookmarklets [2] Non-debug mode (scripts are cached): [1] Debug mode (scripts are not cached): * Implementation [4] User interface part is implemented in . [3] Core part are implemented as separate JavaScript library: [[NR.js]]. * Supported browsers [6] All of major browser engines are supported.