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Editorial Team
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Asked: 2026-05-22T15:22:35+00:00

Which HTML 5 attributes, properties, and other stuff can be degradable in non-supporting browsers,

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Which HTML 5 attributes, properties, and other stuff can be degradable in non-supporting browsers, even without providing fallback?

For example:

<input type="text" placeholder="Type here" />

In a non-supporting browsers the placeholder text will not show , which is ok to me.

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1 Answer

  1. Editorial Team

    As far as the markup goes, pretty much everything degrades well in older browsers:

    • The doctype triggers standards mode in all browsers
    • The new elements display, albeit by default as inline elements (IE’s DOM issues with unknown elements notwithstanding)
    • Unknown attributes don’t cause anything to break in browsers (like your placeholder example)
    • The new form field types all display as text fields in browsers that aren’t aware of them

    They tried to design HTML5 to work in existing browsers; see:

    The new JavaScript APIs obviously won’t work in older browsers, because they don’t exist there.

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