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<blackface> container CSS: start tag required end tag required

This is a WebTV tag. I quote them directly.

"lThe WebTV interface defines the <blackface> tag and renders the text in a double-weight boldface font. The double-weight typeface, as well as the term "blackface" are standards in typography."

Example:
"Make this text <blackface>darker and thicker</blackface> than the rest."