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:
Strand 1: Developing and Sustaining Foundational Language Skills
Strand 2: Comprehension Skills
Strand 3: Response Skills
Strand 4: Multiple Genres
Strand 5: Author’s Craft
Strand 6: Composition
Strand 7: Inquiry and Research