The dialog API is not supported by this browser
I am looking information for HTML <dialog> element. I found example on this URL : https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog But with this example I get the message The dialog API is not supported by this browser ! With google chrome this example works without problem. My firefox version is : 66.0.2 (64 bits)
Chosen solution
It's written in the link you gave us:
Enter about:config in the URL bar and set dom.dialog_element.enabled = true.
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Chosen Solution
It's written in the link you gave us:
Enter about:config in the URL bar and set dom.dialog_element.enabled = true.
Modified