Creating a Custom Dropdown with CSS

Understanding how the element works

• The <select> element is commonly used in forms to collect user input.
• Achieving consistent styling for the native element across different browsers is challenging.
• The native dropdown is implemented as a web component inside a shadow DOM.
• The shadow DOM prevents conflicts between the styles of the component and other elements in the DOM.

Customizing the dropdown with CSS only

• By using CSS, we can achieve consistent styling for the native dropdown.
• CSS pseudo-elements can be used to create a custom arrow without adding additional HTML.
• Disallowing pointer events on the arrow ensures the dropdown opens as expected when interacting with the arrow.

Adding a custom arrow to the native dropdown

• By using CSS pseudo-elements, we can create a custom arrow.
• Styling the native dropdown to resemble the browser's default appearance ensures a consistent design across browsers.
• The dropdown maintains a familiar and uniform look for users.

Considerations for a CSS-only implementation

• Custom styles are limited to the initial appearance of the dropdown.
• Once the dropdown is opened, the list of options will have the browser's default styling.

Creating a custom dropdown from scratch with CSS and JavaScript

• Manually assemble the necessary elements to create a custom dropdown.
• Use radio buttons in the dropdown for smooth keyboard navigation.
• The dropdown will have the same appearance across different browsers.

Adding accessibility features

• Add appropriate ARIA attributes to make the dropdown more accessible for people with disabilities.
• Ensure keyboard navigation and screen readers work properly with the custom dropdown.