css-specificity-id-attribute
RUN
<!DOCTYPE html> <html> <head> <style> div#test {background-color: green;} #test {background-color: yellow;} div[id=test] {background-color: blue;} </style> </head> <body> <div id="test">Đây là phần tử div</div> </body> </html>
PHÓNG TO