How to Apply CSS to Custom HTML5 Elements for Optimal Styling?

Applying CSS to HTML5 Custom Elements

Custom HTML5 elements are powerful tools that extend the capabilities of HTML. However, applying CSS to these custom elements can be a source of confusion.

Proper Styling for Custom Tags

To style custom elements, the standard and safest method is to use CSS selectors that target the element's tag name. The following code snippet illustrates this approach:

<code class="css">scroll-content {
  overflow: hidden;
}</code>

This CSS rule will apply the specified styles to all elements in the document.

Understanding the DOM and Default Styles

It's important to note that browsers have a default style sheet that defines various properties for standard HTML elements. When a custom element is introduced, it does not inherit these default styles unless they are explicitly applied.

If a custom element is not styled in any way, it will render using the CSS initial values for each property. For instance, the default display value for elements is "inline," which can affect the behavior of certain CSS properties, such as "overflow."

Applying "display: block"

To ensure that custom elements behave as expected and can accept the full range of CSS properties, it is recommended to explicitly set the "display" property to "block." This will ensure that the element renders as a block element, inheriting the default styles for block elements from the browser's default style sheet.

By following these guidelines, you can effectively apply CSS to custom HTML5 elements and ensure that they behave consistently across different browsers.

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