.input-group must have a .form-control and either an .input-group-addon or an .input-group-btn.
.input-groups must contain at least two children, one of which must be a .form-control and the other of which must be an .input-group-addon or an .input-group-btn. Otherwise, it doesn't make sense to even use an .input-group.
Wrong:
<div class="input-group"> <input type="text" class="form-control" placeholder="Username"> </div>
Right:
<div class="input-group"> <span class="input-group-addon" id="basic-addon1">@</span> <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1"> </div>
Also Right:
<div class="input-group">
<input type="text" class="form-control" placeholder="Search for...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">Go!</button>
</span>
</div>
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4