Is using without enclosing tags dangerous? [closed]

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It’s not valid markup at all. If it gets displayed correctly, it’s only a matter of luck.

As you seem to define dangerous by “break in browsers for the end user’s ability to view the page as intended”, then yes it’s dangerous.

Browsers are trying their best to compensate for invalid markup but there is no guarantee at all your page gets displayed correctly.

You say validation is the least of your concerns, please reconsider and have a look at Why Validate?. If you care about your page being displayed correctly with no quirks, then validate.

Finally, HTML Tidy may help you fixing existing html.

EDIT: I submitted your fragment to browsershots.org to see how it gets rendered by different browsers.

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