Article en:Timeline_of_the_formation_of_the_Universe has a section named "The first second", which has a diagram for a timeline.
Originally, that diagram isn't huge, but when displayed in CX2 source column, it's so big that translation experience is broken.

Rendering of the timeline is broken, its section is enormous, editing is broken and first paragraph after the timeline is missing (paragraph with the title "Planck epoch").

Here are some shots:

Original timeline	CX2 timeline	Gif showing the section size

In displaying this same timeline, CX1 isn't perfect, but very much usable.