Title: Theory / Unimportant / CS / Descriptive / Material / Component / Backdrop

Name: Backdrop
Definition: back layer displays actions, context and control
Page: https://material.io/components/backdrop#behavior
Definition2: front layer contains content

Question: How can the user activate the backlayer
Answer: Only by doing an action on back layer. NOT by dragging top layer
Page: https://material.io/components/backdrop#behavior
Context: backdrop

Question: What occur when backlayer is activated
Answer: Front layer slide out of view as much as needed, but a small part remain on screen to indicate continuity
Page: https://material.io/components/backdrop#behavior
Context: backdrop

Question: How to activate front layer
Answer: By clicking on it, or reclicking on the open/close icon on the back layer
Page: https://material.io/components/backdrop#behavior
Context: backdrop