I wonder if it is possible in a pure css stencil effect: A block with the background color and the color "transparent", which will reveal the background of the parent block.
For example, I have a parent block with a gradient or pattern as the background, and I want to overlay a block with a black background where the text content will leave the gradient look of the parent block.
I have not found a way to make this work, but maybe someone has an idea or a hint?
EDIT
Sorry, I should not be accurate enough.
Here is an image of the desired result: 
css css3 mask
sacripant
source share