Expected behavior for below pull-down list: Garbage is not displayed.

M5 actual behavior: Garbage from other parts of the page or other windows appears.

A B

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.

This text is here to create a scrollbar.