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Code Indentation

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<div class="container mt-3">
<!--div預設為block區塊元素,加入 .d-inline 變行內元素,寬度沒有100%延伸,只有文字寬度-->
<!--試試把 d-block 加入 .d-inline Class ,因兩個都是行內元素會變成同行-->
  <div class="bg-success mb-1 d-inline">d-inline</div>
  <div class="bg-success mb-1">d-block</div>

<div class="container mt-3">
<!--span 預設為inline,加入 .d-block 變區塊元素-->
  <span class="bg-primary mb-1 d-block">d-block</span>
  <span class="bg-primary mb-1">d-inline</span>

<!--inline-block 結合inline 與 block 屬性-->
<div class="container mt-3">  
  <div class="bg-info mb-1" style="height:50px;">d-inline-block加入height顯示高度</div>
  <div class="bg-info d-inline" style="height:50px;">d-inline加入高度無效</div>
  <div class="bg-info d-inline-block">d-inline-block 未加入高度看來與 d-inline差異不大</div>