HTML Form is allowing to skip required <select> tags

[TheLovableCodeMan]

Right, why is my HTML form allowing users to skip just the one dropdown select tag, despite having the "required" attribute within the "select" tag?

This is an extract:

<form>
<select  class="" id="standard-select" name="title" required>
    <option selected disabled>Title *</option>
    <option>Dr.</option>
    <option>Mr.</option>
    <option>Mrs.</option>
    <option>Ms.</option>
    <option>Prof.</option>
    <option>Rev.</option>
    <option>Pastor.</option>
    <option>Miss.</option>
</select>
<form/>

Is the "required" attribute implements so users to not be able to skip, or have I missed something here?

The rest of my "select" tags have the "required" attribute and they work as expected?