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In 4.6.21 "The ruby element", under "set the current base text", step 1 says: Let text range a DOM range ... and under "push a ruby annotation", step 2 says: Let annotation range a DOM range ... In each case, insert "be" before "a".
Good catch, thanks!
Checked in as WHATWG revision r7793. Check-in comment: Fix some typos or copypasta. http://html5.org/tools/web-apps-tracker?from=7792&to=7793