Rotation results in inconsitent points

[phillmagic]

Expected Behavior

Expecting the height and width of the viewport to remain the same regardless of rotation added to the viewport boundary

Actual Behavior

The height is not accurate based on analysed calculation

Steps to Reproduce the Problem

1. Add rotation to the viewport style (transform: rotate(30deg)
2. Try and get points
3. Calculate height with rotation, calculate height without rotation, different result

Example Link

Please recreate your issue using JSbin, JSFiddle, or Codepen.

• Link:

Specifications

• Browser: Google chrome
• Version: