As a result of the Great Vowel Shift, the long of "face" was raised, initially to and later to . After 1700 it was raised even further, and then diphthongized, leading to the modern standard pronunciation . Additionally, the short of "trap" was fronted to ; this change became accepted in standard speech during the 17th century. Today there is much regional variation in the realization of this vowel; in RP there has been a recent trend for it to be lowered again to a fully open .