盒子模型、边框、内外边距对绝对定位的影响
有如下布局:
<div class="father">
father
<div class="son"></div>
<div class="son1"></div>
</div>
有如下样式:
.father {
position: relative;
left: 100px;
box-sizing: border-box;
width: 200px;
height: 200px;
padding: 20px;
border: 10px solid blueviolet;
background-color: #fff;
}
.son {
box-sizing: content-box;
position: absolute;
left: 10px;
width: 100px;
height: 100px;
border: 10px solid pink;
background-color: yellow;
opacity:0.4;
}
.son1 {
box-sizing: border-box;
width: 150px;
height: 150px;
border: 10px solid green;
background-color: skyblue;
}
效果图如下:
总结与认识
- 子盒子是以父盒子边框的内边界为起点便宜的;
- 子盒子的偏移会忽略父盒子的内边距的影响;
- 无论盒子模式是border-box,还是content-box,上述两点均成立;