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<html><head><style>div#a {background-color: green;}#a {background-color: yellow;}div[id=a] {background-color: blue;}</style></head><body><div id="a">Это div</div></body></html> <html><head><style>div#a {background-color: green;}#a {background-color: yellow;}div[id=a] {background-color: blue;}</style></head><body><div id="a">Это div</div></body></html>