The code just iterates over all attributes of the <body> element and evaluates values of all these attributes as JavaScript. Because there was no other sources in the challenge, it meant that solving it requires finding a way to inject arbitrary attribute value into the document.body. So how’s that possible? It all started when I noticed an interesting snippet in the HTML specification. The 14th s
'xxx-large' 15.3.5 Bidirectional text @namespace "http://www.w3.org/1999/xhtml"; [dir]:dir(ltr), bdi:dir(ltr), input[type=tel i]:dir(ltr) { direction: ltr; } [dir]:dir(rtl), bdi:dir(rtl) { direction: rtl; } address, blockquote, center, div, figure, figcaption, footer, form, header, hr, legend, listing, main, p, plaintext, pre, summary, xmp, article, aside, h1, h2, h3, h4, h5, h6, hgroup, nav, sect
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