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Explanation
Country
Flag
"...depicted the starry sky of twenty-seven small white five-pointed stars spanned by the white equatorial curved band..."
Brazil
🇧🇷
"The yellow alludes to the Equator – which cuts across the country – and also symbolizes the sun."
Gabon
🇬🇦
"The rising sun is the tropical sun as Kiribati lies astride the Equator"
Kiribati
🇰🇮
"The rising diagonal band represents the equator, the star above representing this Northern Hemisphere archipelago."
Marshall Islands
🇲🇭
"The narrow gold stripe with a width of 1⁄12 of the length of the flag represents the Equator. The stripe along with the star signifies the location of the island in the Pacific Ocean one degree south of the Equator."
It just shows the letters. People point it out in other quizzes and everyone says what browser they're using, but browser is a red herring. Emojis are part of Unicode, and Unicode rendering is the OS. Microsoft hasn't enabled emoji flags for some reason, despite people complaining for years.