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What consequences can I get with an undefined HTML element?

In an attempt to write more expressive HTML, I feel that custom HTML elements are a good way for any webapp or document that I can write to make good sense, sparkling from the tag name itself without using comments.

It seems I can define a custom HTML element with:

document.registerElement("x-el");

However, it also seems that I can use a custom element before defining it:

<body>
    <x-salamander>abc</x-salamander>
</body>

Or even:

<salamander>abc</salamander>

I assume this is invalid HTML, however both Firefox and Chromium continue to display the element without any problems or console warnings.

I can even do the following without any complaints in the browser:

document.getElementsByTagName("salamander")[0]

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The purpose of Angular is wider in that it treats HTML as if HTML was a tool for creating applications, not just displaying documents. For me, this broader goal gives real meaning and purpose for being able to extend HTML, as described in your question.

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Source: https://habr.com/ru/post/1543080/

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