What is Cap Gap Extension? How does it work?

Question details

1) Is H1B cap-exempt to H1B lottery-based considered a change of status?

2) If I currently have an H1B cap-exempt visa and am filing for an H1B petition in June, when can I not travel outside of the US - from now to June, June to Petition Approval, or from Petition Approval to Oct ? My current H1B visa would be valid until Nov.

 

ANSWER
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FAQ Transcript

Yes, potentially. It allows you to work while your STEM OPT expires (April 30th in your case), and your H-1B petition is pending, extending your work authorization until October 1st.