select default value
<option selected>
5
</option>
html form reject default drop down list
//To force form validation on a select input:
//you need to use the required attribute on your select form and
//set the value of the initial option to "".
//Notice that you have to set the value -""- as invalid
<form>
<select id="cars" name="cars" required aria-invalid="">//Required tag + "" is considered invalid
<option value="" selected disabled hidden>Choose car...</option> //Default option
<option value="volvo">Volvo XC90</option>
<option value="saab">Saab 95</option>
<option value="mercedes">Mercedes SLK</option>
<option value="audi">Audi TT</option>
</select>
<button type="submit">Submit</button>
</form>
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