CSS3制作的非空验证表单提示效果

/* === List Styles === */.contact_form ul { list-style-type:none; list-style-position:outside; margin:0px; padding:0px;}.contact_form li{ padding:12px; border-bottom:1px solid #eee; position:relative;} .contact_form li:first-child, .contact_form li:last-child { border-bottom:1px solid #777;}/* === Form Header === */.contact_form h2 { margin:0; display: inline;}.required_notification { color:#d45252; margin:5px 0 0 0; display:inline; float:right;}/* === Form Elements === */.contact_form label { width:150px; margin-top: 3px; display:inline-block; float:left; padding:3px;}.contact_form input { height:20px; width:220px; padding:5px 8px;}.contact_form textarea {padding:8px; width:300px;}.contact_form button {margin-left:156px;} /* form element visual styles */ .contact_form input, .contact_form textarea { border:1px solid #aaa; box-shadow: 0px 0px 3px #ccc, 0 10px 15px #eee inset; border-radius:2px; padding-right:30px; -moz-transition: padding .25s; -webkit-transition: padding .25s; -o-transition: padding .25s; transition: padding .25s; } .contact_form input:focus, .contact_form textarea:focus { background: #fff; border:1px solid #555; box-shadow: 0 0 3px #aaa; padding-right:70px; }/* === HTML5 validation styles === */ .contact_form input:required, .contact_form textarea:required { background: #fff url(images/red_asterisk.png) no-repeat 98% center;}.contact_form input:required:valid, .contact_form textarea:required:valid { background: #fff url(images/valid.png) no-repeat 98% center; box-shadow: 0 0 5px #5cd053; border-color: #28921f;}.contact_form input:focus:invalid, .contact_form textarea:focus:invalid { background: #fff url(images/invalid.png) no-repeat 98% center; box-shadow: 0 0 5px #d45252; border-color: #b03535}/* === Form hints === */.form_hint { background: #d45252; border-radius: 3px 3px 3px 3px; color: white; margin-left:8px; padding: 1px 6px; z-index: 999; /* hints stay above all other elements */ position: absolute; /* allows proper formatting if hint is two lines */ display: none;}.form_hint::before { content: "\25C0"; color:#d45252; position: absolute; top:1px; left:-6px;}.contact_form input:focus + .form_hint {display: inline;}.contact_form input:required:valid + .form_hint {background: #28921f;}.contact_form input:required:valid + .form_hint::before {color:#28921f;}

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