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Add Watermark on pages conditionally

I would like to add a watermark similar to the PlanetPress Demo watermark that allows the data to be visible. In this situation the message would be on top of a simulated greybar. The message would be a relatively small string like VOID, CREDIT, DUPLICATE, PAST DUE, COPY, but displayed larger and at -35 degrees.

Tried this, but the fill displays on preview or print.

.watermark {
		-1px -1px 0 #000,
		1px -1px 0 #000,
		-1px 1px 0 #000,
		1px 1px 0 #000;
		opacity: 0.5;

I located a arialic-hollow font that appears to produce outline/hollow only with transparent fill.