html - bootstrap not getting dismissable warning -

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i'm new bootstrap. tutorials i've seen

<div  class="alert alert-warning" style="margin-left: 480px;margin-top: 20px;width: 500px;">  warning message here  </div>

this should give me dismissable warning message.

but i'm getting warning message, not dismissable.

is there wrong code?

you need use -

<div role="alert" class="alert alert-warning alert-dismissible fade in"  style="margin-left: 480px;margin-top: 20px;width: 500px;">    <button aria-label="close" data-dismiss="alert" class="close" type="button"><span aria-hidden="true">×</span></button>    <strong>holy guacamole!</strong>  warning message here  </div>

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