Bug 135619 – Opacity values are not clamped during transition causing elements with identical colors to become temporarily distinct

• Status: RESOLVED
• Resolution: INVALID
• Component: CSS

When putting a CSS transition the opacity property with a cubic-bezier curve that goes out of [0,1] range (i.e. [0,2,0,2]), changing opacity can cause the element flashes because opacity is not clamped.

Steps to Reproduce:
-Go to: http://jsfiddle.net/ETzZe/7/
-Hover over the box
-Notice the circle inside the box lighting up

Expected result:
Since both the circle and box have the same background-color, and the circle is just changing opacity, no visible change should have occurred.

Actual result:
The opacity of the circle is being transitioned on hover, the opacity value appears to temporarily go beyond 1.0 and the circle lights up.

This appears to work fine on webkit Safari and only affects Chrome... marking as resolved.