可疑网格:按位置定位元素不起作用

Question

试图弄清楚Susy和我在按位置定位元素时遇到了问题。'first和last按预期工作，但使用特定列的编号则不然。我哪里错了？

.number {
  @include span(4 at 5);
}

请参阅演示：http://sassmeister.com/gist/aad8a46d927b59573695

或完整代码：

  @import "susy";
  $susy: (
    flow: ltr, // ltr | rtl
    output: float, // float | isolate
    math: fluid, // fluid | static (requires column-width)
    column-width: false, // false | value
    container: 800px, // length or % | auto
    container-position: center, // left | center | right | <length> [*2] (grid padding)
    last-flow: to,
    columns: 12,
    gutters: .75,
    gutter-position: after, // before | after | split | inside | inside-static (requires column-width)
    global-box-sizing: content-box, // content-box | border-box (affects inside/inside-static)
    debug: (
      image: show,
      color: rgba(#66f, .25),
      output: background, // background | overlay
      toggle: top right,
    ),
    use-custom: (
      background-image: true, // look for background-image mixin
      background-options: false, // look for background-size, -origin and -clip and other compass/bourbon mixins
      box-sizing: true, // look for custom bix sizing mixin
      clearfix: false, // true = look for internal clearfix before using micro clearfix
      rem: true, // look for rem mixin
    )
  );

  .page {
    @include container;
  }
  .row {
    @include full;
  }
  .first {
    @include span(4);
    background-color:pink;
  }
  .last {
  @include span(last 4);
  background-color:orange;
}
.number {
  @include span(4 at 5);
  background-color: wheat;
}

<div class="page">
    <div class="row">
      <div class="first">hooray I'm first</div>
      <div class="last">hooray I'm last</div>
    </div>
    <div class="row">
      <div class="number">boo I'm not at my specific location</div>
    </div>
</div>

Answer 1

刚刚意识到我的错误（以防其他人需要它）："at"关键字仅适用于隔离输出，并且我的网格设置为浮动。若要修复此问题，可以将float更改为在整体设置中隔离，也可以将其直接应用于有问题的元素。

.number {
  @include span(isolate 4 at 5);
}

http://sassmeister.com/gist/42d1efaf1ddd9c721379