this post was submitted on 12 May 2024
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[–] [email protected] 41 points 4 months ago* (last edited 4 months ago)

Seems to be so, see Exceptional behavior of document.all

Although document.all is also falsy and loosely equal to undefined, it is not undefined. The case of document.all having type "undefined" is classified in the web standards as a "willful violation" of the original ECMAScript standard for web compatibility.