html option disable select select disable option introduction

If you don’t want users to choose, you can disable the html option and disable the select option. The following is the specific implementation. I hope it will be helpful to everyone.

The code is as follows:

<select> 
<option value="">1</option> 
<option value="">2</option> 
<option value="">3</option> 
<option value="">4</option> 
<option value="">5</option> 
</select>

I don’t want users to be able to choose 345. What should I do?

The code is as follows:

<select> 
<option value="">1</option> 
<option value="">2</option> 
<optgroup label="3"></optgroup> 
<optgroup label="4"></optgroup> 
<optgroup label="5"></optgroup> 
</select>

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