1. Parity attributes:
/*odd*/
ul li:nth-child (odd){
background-color: green;
}
< em id="__mceDel" style="font-family:'Courier New'; font-size: 12px;"> /*even*/
em>< em id="__mceDel">ul li:nth-child(even){< /em>
< em id="__mceDel">background-color: red;
}
2.
1 class diagram (1) UML arrow direction: From the child class to the parent class. You need to pass the extends keyword when defining a subclass, so the subclass must know the parent but the parent
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