SOURCE

<div class="box">
  <div class="inner1 align">为什么？</div>
  这是基线
  <div class="inner1"></div>
</div>

.inner1 {
    width: 100px;
    height: 100px;
    border:1px solid red;
    display: inline-block;
}
.align{
/*    vertical-align: top;*/
}

.box {
  border: 1px solid green;
}