<story><title>You Don&apos;t Know GIF – An analysis of a GIF file and some weird GIF features</title><url>https://blog.darrien.dev/posts/you-dont-know-gif</url></story><parent_chain><item><author>Hitton</author><text>&amp;gt;Now the first line ends like this which is still a perfectly valid gif. How might that look?&lt;p&gt;&amp;gt;Amazing! Stupendous! Wonderful! As of the time of this writing, it’s just a perfectly black square. And this is the case in every single renderer I’ve tried. Gimp, Chrome, Firefox, Preview, gifiddle, you name it.&lt;p&gt;Funnily enough in my browser (Firefox on Ubuntu) it&amp;#x27;s transparent, but it&amp;#x27;s level of transparency I have never seen before - I can see the window below.</text></item></parent_chain><comment><author>OscarCunningham</author><text>I&amp;#x27;ve reported this as a bug here: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;bugzilla.mozilla.org&amp;#x2F;show_bug.cgi?id=1758975&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;bugzilla.mozilla.org&amp;#x2F;show_bug.cgi?id=1758975&lt;/a&gt;</text></comment>
<story><title>You Don&apos;t Know GIF – An analysis of a GIF file and some weird GIF features</title><url>https://blog.darrien.dev/posts/you-dont-know-gif</url></story><parent_chain><item><author>Hitton</author><text>&amp;gt;Now the first line ends like this which is still a perfectly valid gif. How might that look?&lt;p&gt;&amp;gt;Amazing! Stupendous! Wonderful! As of the time of this writing, it’s just a perfectly black square. And this is the case in every single renderer I’ve tried. Gimp, Chrome, Firefox, Preview, gifiddle, you name it.&lt;p&gt;Funnily enough in my browser (Firefox on Ubuntu) it&amp;#x27;s transparent, but it&amp;#x27;s level of transparency I have never seen before - I can see the window below.</text></item></parent_chain><comment><author>kevincox</author><text>If Firefox is maximized I just see other text on the page as I scroll. If I make it a floating window I sometimes see other page content and sometimes see the window below. Very strange.&lt;p&gt;I wonder if this could be used for some sort of phishing attack by tricking the user into thinking it is some OS trusted dialog or just showing that you know something secret so you should be trusted (would be hard to set up to work with any sort of probability though).</text></comment>