WordPress: Fix the srcDoc patch in WordPress block-editor.js #408
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Gutenberg loads the site editor using <iframe srcDoc="<!doctype html>" to force the standards mode and not the quirks mode:
WordPress/gutenberg#38855
This commit patches the site editor to achieve the same result via <iframe src="/doctype.html"> and a doctype.html file containing just
<!doctype html>
. This allows the iframe to inherit the service worker and correctly load all the css, js, fonts, images, and other assets.More details: #91 (comment)