html - How to get a warning that a class name is not recognized? -

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today wrote code: 

<div class="container">   <form class="form-inline" role="form">     <div class="form-group">       <label for="first">first</label>       <input class="form-control" id="first" ng-model="???" ng-readonly="true" />     </div>      <div class="form-group">       <label for="second">second</label>       <input class="form-control" id="second" ng-model="???" ng-readonly="true" />     </div>      <div class="form-group">       <label for="third">third</label>       <input class="form-control" id="third" ng-model="???" ng-readonly="true" />     </div>      <div class="form-group">       <label for="fourth">fourth</label>       <input class="form-control" id="fourth" ng-model="???" ng-readonly="true" />     </div>   </form> </div>

the purpose of code form of element in same line. in order make happen, used class "form-inline", part of bootstrap directory. however, since didn't loaded bootstrap files in header, got elements in separate lines.

so spent lot of time understand wrong file. expect browser/ide gives error using unknown class. know how can feature?


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