Fullscreen iframes definitely don’t have a border in Firefox, among others. https://searchfox.org/mozilla-central/source/layout/style/res/html.css https://sear

Fullscreen iframes definitely don’t have a border in Firefox, among others. https://searchfox.org/mozilla-central/source/layout/style/res/html.css https://searchfox.org/mozilla-central/source/layout/style/re...