Drop-down list fields

Drop-down lists are a great way to give users lots of options in a small amount of screen space. 

You use two tags to create a drop-down list:

• <select> creates the list. Use a name attribute with the <select> element to name your list.
• A collection of <option> elements identifies individual list options. The value attribute assigns a unique value for each <option> element.

Here’s a markup example for a drop-down list:https://stackblitz.com/edit/web-platform-mhujpo?embed=1&file=index.html&hideDevTools=1&hideExplorer=1&hideNavigation=1

The browser turns this markup into a drop-down list with three items.

You can also enable users to select more than one item from a drop-down list by changing the default settings of your list:

• If you want your users to be able to choose more than one option (by holding down the Ctrl [Windows] or ⌘ [Mac] key while clicking options in the list), add the multiple attribute to the <select> tag. The value of multiple is multiple. If you give a stand-alone attribute a value, that value must be the same as the name for the attribute itself (that is, both multiple and multiple=”multiple” are legal).
• By default, the browser displays only one option until the user clicks the drop-down menu arrow to display the rest of the list. Use the size attribute with the <select> tag to specify how many options to show. If you specify fewer than the total number of options, the browser includes a scroll bar with the drop-down list. 

You can specify that one of the options in the drop-down list be already selected when the browser loads the page, just as you can specify a check box or radio button to be selected. Simply add the selected attribute for the <option> tag you want as the default. Use this when one choice is very likely, knowing that users can override your default selection quickly and easily.

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