Editorial fixture / not a published article
The same word should not stand in for three different decisions.
New synthetic writing for private review. No publication date, owner biography, client result or unavailable video is implied.
Chapter 01
The source is present
A file comparison can establish that a shader or geometry factory was retained. It cannot establish that the browser used it or that the result matched the reference.
That limit gives the comparison a clear job.

Chapter 02
The runtime responds
An interaction capture adds another kind of evidence and records the device, viewport and motion preference.
A fallback can pass its own test without passing the primary effect.
Chapter 03
The result is accepted
Visual acceptance asks whether hierarchy, material, timing and character remain intact.
Name each gate separately and never turn missing evidence into a pass.