Q: Can my dependent H4 travel outside US when H4 extension is in process?

I am an IT engineer living in the US with my spouse and child. I received my My H1B visa extension approval this week (valid till 2021), immediately after which my employer filed for H4 visa extension for my dependent spouse and child. Questions: 1. While my dependents’ H4 visa is in process, can they travel outside of the US to India for a vacation? Will they be allowed re-entry to US if their visa is still under process? 2. As H1B holder, can I fill DS 160 for dependent H4 and go for stamping - will it get stamped? Or should dependents wait in the US until the application under process is approved? Thank you!

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