input type text CSS selector does not apply to default-type text inputs

Question

Text is the default input type. Therefore, I have always thought that input[type='text'] would be affected by CSS declarations even if the type was not explicitly defined on the control. But I've recently realised that the styles are not applied to my default-type text inputs. How come this is the case? And how do I deal with this?

input[type='text'] {
  background: red;
}

<input name='t1' type='text' /> /* Is Red */
<input name='t1' /> /* Is Not Red */