Add text-align’s <string> value (#2442)
Add text-align’s <string> value (#2442)

See https://drafts.csswg.org/css-text-4/#alignment
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,teoli2003/browser-compat-data,chrisdavidmills/browser-compat-data