[selector] CSS - :required 가상선택자 - 필수입력요소 (= required속성있는요소, IE10)

:required 예제

 

<style>

input:required {background-color: yellow;}

input:optional {background-color: silver;}

</style>

<h3>홈짱닷컴 Homzzang.com</h3>

<p>아이디 필수: <input required></p>

<p>닉네임 선택: <input></p>

 

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