HTML Imports was deprecated

[nom3ad]

Chrome and chromium based browsers are dropping support for html imports.

reference: https://www.chromestatus.com/feature/5144752345317376

HTML Imports are deprecated at M70, and will be removed in M73, around, April 2019.

And follwing check for supported browser going to fail.

xel/index.html

Lines 36 to 48 in 1b67933

	<script>
	// Supported browser
	if (window.ShadowRoot && window.customElements && HTMLLinkElement.prototype.hasOwnProperty("import")) {
	let theme = sessionStorage.getItem("theme") || "material";
	let themePath = `/node_modules/xel/themes/${theme}.css`;
	document.querySelector("#theme-link").setAttribute("href", themePath);
	window.addEventListener("load", function(event) {window["splashscreen"].remove()});
	}
	// Unsupported browser
	else {
	window.location.replace("/fallback.html");
	}
	</script>

[nom3ad]

Hey, Thanks for the quick fix.
finally, I was able to xel run on Firefox.
A lot of bugs though. But many components work properly with the vanilla theme.

[jarek-foksa]

I'm afraid Xel is unlikely to support Firefox anytime soon. Proper support would require adding a lot of special casing which I would prefer to avoid.