You can help older browsers process HTML5.

HTML5 Browser Support

All modern browsers support HTML5. (Recommended learning:html tutorial)

In addition, all browsers, old and new, will automatically treat unrecognized elements as inline elements.

Because of this, you can help older browsers handle "unknown" HTML elements.

Note:You can even teach Stone Age IE6 how to handle unknown HTML elements.

Defining HTML5 elements as block-level elements

HTML5 defines eight new semantic HTML elements. All are block-level elements.

You can set the CSS display property to block to ensure correct behavior in older browsers:

Example

header, section, footer, aside, nav, main, article, figure { display: block; }

Ask HTML Adding New Elements

You can add any new element to HTML via browser tricks:

This example adds a new element named 523a75af872c9b7da9495f252f14cbcb to HTML, and Define the display style for it:

Instance

      
  
My First Heading
 
My first paragraph.
 My First Hero  

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