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all targets all CSS properties that can be defined for the element. You’re only allowed to set it to
unset. It can be useful for reset styles.
Below is the test element in its standard styles. We’re going to change it by using the
If the tests below have a border and grey background,
all is not supported.
It should have a wildly weird margin/padding because the body has one.
It should have black text that’s slightly larger than on the rest of the page.
It should be blue, without borders or backgrounds.