For Mac OS users, there is a system setting that may not allow you to tab onto several types of elements in a web page. To change this setting:
Mrs. Lumpkin/Ms. Hinton
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Mrs. Slade/Ms. M Smith
Mrs. Simmons/Ms. Sutton
Mrs. LeBatard/Ms. Griffin
Ms. Whatley
Ms. McDonnell/Ms. A. Carter
Ms. Reese
Mrs. Smith/Ms. Alexander
Ms. Prince/Mrs. K. Williams
Ms. Lincks/Ms. House