HTML China supports the Optgroup tag of the category Select drop-down box

Use the Optgroup tag, which is not commonly used in HTML, to classify the options of the Select drop-down box. Maybe you don’t know it yet. In fact, among the tags that come with the HTML language, there are many ignored tags like this. Sometimes they The functions that can be completed are even better than those that we can only complete after half a day of coding. There is a function of using the Optgroup tag that is not commonly used in HTML to classify the options of the Select drop-down box. Maybe you don’t know it yet. , in fact, among the tags that come with the HTML language, there are many ignored tags like this. Sometimes the functions they can complete are even better than the ones we can’t complete even after writing half a day of code. Friends who are interested need to study it. .

<title>可以分类显示的Select下拉框丨PHPhtm网页特效|www.PHPhtm.com</title>
<select>
    <optgroup label="WEB编程">
        <option>ASP</option>
        <option>PHP</option>
        <option>Ajax</option>
    </optgroup>
    <optgroup label="WinForm编程">
        <option>VB</option>
        <option>VC</option>
        <option>C#</option>
        <option>Delphi</option>
    </optgroup>
</select>

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