html – 切角和半透明背景的元素

发布时间：2020-12-14 23:26:12 所属栏目：资源来源：网络整理

导读：我需要创建一个带有切角和边框的流畅形状.形状需要能够坐在未知的背景上.这本身不是问题,但我还需要这个元素的背景是半透明的. 这是我到目前为止所拥有的…… * { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box;}bo

我需要创建一个带有切角和边框的流畅形状.形状需要能够坐在未知的背景上.这本身不是问题,但我还需要这个元素的背景是半透明的.

这是我到目前为止所拥有的……

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
    background: pink;
}

.sidebar-widget {
    border: 1px solid #44AAAB;
    border-right: none;
    border-bottom: none;
    position: relative;
    padding: 15px 0 0 15px;
    margin-bottom: 20px;
}

.sidebar-widget .inner {
    position: relative;
    padding: 15px 0 0 15px;
    left: -15px;
    top: -15px;
    background: #f2f2f2;
}

.sidebar-widget .inner:before {
    content: "";
    width: 100%;
    height: 15px;
    background: #f2f2f2;
    border: 1px solid #44AAAB;
    border-right: none;
    border-top: none;
    position: absolute;
    left: -1px;
    bottom: -16px;
}

.sidebar-widget .inner .content:after {
    content: "";
    width: 15px;
    height: 100%;
    background: #f2f2f2;
    border: 1px solid #44AAAB;
    border-left: none;
    border-bottom: none;
    position: absolute;
    right: -16px;
    top: -1px;
}

.corner {
    width: 22px;
    height: 22px;
    border-right: 1px solid #44AAAB;
    background: #f2f2f2;
    position: absolute;
    right: 4px;
    bottom: 4px;
    transform: rotate(45deg);
    z-index: 1;
}

.sidebar-widget.trans-bg .inner,.sidebar-widget.trans-bg .inner:before,.sidebar-widget.trans-bg .inner .content:after,.trans-bg .corner {
    background: rgba(0,0.5);
}

<div class="sidebar-widget">
    <div class="corner"></div>
    <div class="inner">
        <div class="content">
            Lorem ipsum dolor sit amet,consectetur adipiscing elit. Nam tellus felis,faucibus id velit eget,auctor tristique ex. Pellentesque id dolor risus. Donec tincidunt,nisl id laoreet tristique,ligula magna placerat mi,id congue magna diam ut sem. Aenean ornare eros nec sapien porta,laoreet venenatis est lobortis.
        </div>
    </div>
</div>

<div class="sidebar-widget trans-bg">
    <div class="corner"></div>
    <div class="inner">
        <div class="content">
            Lorem ipsum dolor sit amet,laoreet venenatis est lobortis.
        </div>
    </div>
</div>

当元素具有纯色背景时,此方法有效,但是当您使用半透明背景时,您可以看到用于创建截止角的方形元素清晰可见.任何人都可以想办法解决这个问题吗？

JSFiddle version

解决方法

对于任何对此感兴趣的人,我最终都是这样做的.

将.corner包装在另一个带溢出的元素中：隐藏;

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
    background: pink;
}

.sidebar-widget {
    border: 1px solid #44AAAB;
    border-right: none;
    border-bottom: none;
    position: relative;
    padding: 15px 0 0 15px;
    margin-bottom: 20px;
}

.sidebar-widget .inner {
    position: relative;
    padding: 15px 0 0 15px;
    left: -15px;
    top: -15px;
    background: #f2f2f2;
}

.sidebar-widget .inner:before {
    content: "";
    width: 100%;
    height: 15px;
    background: #f2f2f2;
    border: 1px solid #44AAAB;
    border-right: none;
    border-top: none;
    position: absolute;
    left: -1px;
    bottom: -16px;
}

.sidebar-widget .inner .content:after {
    content: "";
    width: 15px;
    height: 100%;
    background: #f2f2f2;
    border: 1px solid #44AAAB;
    border-left: none;
    border-bottom: none;
    position: absolute;
    right: -16px;
    top: -1px;
}

.corner-mask {
    width: 15px;
    height: 15px;
    position: absolute;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.corner {
    width: 22px;
    height: 22px;
    border-right: 1px solid #44AAAB;
    background: #f2f2f2;
    position: absolute;
    right: 4px;
    bottom: 4px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
    z-index: 1;
}

.sidebar-widget.trans-bg .inner,0.5);
}

<div class="sidebar-widget">
    <div class="corner-mask">
        <div class="corner"></div>
    </div>
    <div class="inner">
        <div class="content">
            Lorem ipsum dolor sit amet,laoreet venenatis est lobortis.
        </div>
    </div>
</div>

<div class="sidebar-widget trans-bg">
    <div class="corner-mask">
        <div class="corner"></div>
    </div>
    <div class="inner">
        <div class="content">
            Lorem ipsum dolor sit amet,laoreet venenatis est lobortis.
        </div>
    </div>
</div>

JSFiddle version

（编辑：李大同）

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