nbsp between number and unit: 5 km.

nbsp in French quote and before exclamation: « quote ! »

Alternating spaces and nbsps between words with spaces touching words: one     two

Alternating spaces and nbsps between words with nbsps touching words: one     two

One space and multiple nbsps between words: one    two

Multiple nbsps and one space between words: one    two

Multiple nbsps between words: one    two