Grammalecte  Check-in [a6007f74a3]

            // Firefox 63+, Chrome 66+
            // Working draft: https://developer.mozilla.org/en-US/docs/Web/API/Clipboard
            navigator.clipboard.writeText(sText)
            .then(
                (res) => { window.setTimeout(() => { this.xClipboardButton.textContent = "📋"; }, 2000); }
            )
            .catch(
                (e) => { showError(e); this._sendTextToClipboard(sText); }
                (e) => { showError(e); this._sendTextToClipboardFallback(sText); }
            );
        } else {
            this._sendTextToClipboardFallback(sText);
        }
    }

    _sendTextToClipboardFallback (sText) {