This is a small playground for my Roll.js library, which is designed to compute exact results for dice rolls of arbitrary complexity (rather than simulating several thousand rolls for an approximate answer).

Several things are visible to code written in the input pane:

• The Roll.js library itself, as the global R.
• The Roll class from Roll.js, as the global Roll.
• The DOM.js library, as the global DOM (to let you easily create other elements).
• A log() function, which will console.log() the value, and add it to the output pane. Nodes and text are appended directy; Roll objects log their .text() results to the console and put their .table() results in the output pane.

  The result of the final expression in the code pane will be automatically log()'d.

The code won't run until you press the ↵ button, at which point the page's hash will also update to contain the code, so you can easily share links.

Some example rolls:

• d20 with advantage
• sum of 3d6
• Greatsword damage, with Great Weapon Master (2d6, reroll 1s and 2s a single time)
• A d5, simulated by rerolling a d6 whenever it comes up 6
• D&D 5e death save outcomes