https://caniuse.com/mdn-api_htmloutputelement_defaultvalue
HTMLOutputElement API: defaultValue | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
can i use
https://www.w3schools.com/jsref/prop_text_defaultvalue.asp
HTML DOM Input Text defaultValue Property
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
html dominputtextdefaultvalueproperty
https://defaultvalue.org/
defaultvalue
defaultvalue