CSS -- 透明 "glass"模态，其他一切变暗

Question

THE ANSWER: background-attachment

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答案是使用background-attachment

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ORIGINAL QUESTION

我正在做一个元素，我们想要显示一个“透视”背景的模态，但模态面板之外的所有地方都被轻微遮盖了。

我已经成功地将 border: 10000px rgba(0,0,0,0.3) 与 border-radius: 10010px 一起使用，但这是一个 hack，我可以' t 用 box-shadow

勾勒出模态框

有什么标准的方法可以做到这一点吗？如果您能想出一种方法将透明滤镜渐变应用于图像，则可加分。

Answer 1

我认为你在这里得到的最佳选择是有一个 3 行，其中中间的行包含 3 列，并且顶部底部的行和左右列(中间行的)具有变暗的背景:

$(function() {
  $('button').click(function() {
    tpl = '<div class="modal-reverse-container"><div class="r1"></div><div class="r2"><div class="c1"></div><div class="c2"></div><div class="c3"></div></div><div class="r3"></div></div>'
    $('body').append($(tpl));
    $('.modal-reverse-container').width($(document).width());
    $('.modal-reverse-container').height($(document).height());
    $('.modal-reverse-container r1, .modal-reverse-container r2').height($(document).height());
  });
  $(document).on('click', '.modal-reverse-container', function() {
    $(this).remove();
  });
});

td {
  text-align: center;
  background: red;
}
.modal-reverse-container {
  position: absolute;
  top: 0;
  left: 0;
}
.modal-reverse-container .r1, .modal-reverse-container .r2, .modal-reverse-container .r3 {
  height: 33%;
}
.modal-reverse-container .r1, .modal-reverse-container .r3 {
  background: rgba(0, 0, 0, 0.7);
}
.modal-reverse-container .r2 .c1, .modal-reverse-container .r2 .c2, .modal-reverse-container .r2 .c3 {
  width: 33%;
  height: 100%;
  float: left;
}
.modal-reverse-container .r2 .c3 {
  float: right;
}
.modal-reverse-container .r2 .c1, .modal-reverse-container .r2 .c3 {
  background: rgba(0, 0, 0, 0.7);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table width="100%">
  <tr>
    <td>1</td>
    <td>2</td>
    <td>3</td>
  </tr>
</table>
<img src="https://dummyimage.com/600x400/d950d9/fff" />
<div>
  Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.
</div>
<button>Set reverse-modal</button>