W017

Found one or more `<input>`s missing a `type` attribute.

It's best-practice to always set an explicit type on <input>s. If an <input> lacks a type attribute, it defaults to being a type="text".

Bootstrap will only fully style <input>s which have a valid type attribute.

Wrong:

<input value="Something">

Right:

<input type="text" value="Something">

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