Your browser reclaimed the graphics context — usually another heavy tab, or a phone running low. The race is paused, not lost.
Close a tab or two and it should come back on its own. Reloading always works.
ESC resume · R or DELETE restart · C camera · B look back
SPACE handbrake drift · SHIFT nitro boost
Tap RESUME to carry on
Will you race this again?
What would bring you back?
What kind of tracks do you want?
How was the track itself?
Were the controls clear?