Kate editing html, document Preview is failing to display a simple html test

Kate editing html, document Preview is failing to display a simple html test
plugin vscode-html-languageserver installed correctly.

{
    "servers": {
        "verilog": {
            "command": [
                "verible-verilog-ls"
            ],
            "root": "",
            "url": "https://github.com/chipsalliance/verible"
        },
        "systemverilog": {
            "command": [
                "verible-verilog-ls"
            ],
            "root": "",
            "url": "https://github.com/chipsalliance/verible"
        },
	"html": {
            "command": ["/usr/bin/vscode-html-languageserver", "--stdio"],
            "url": "https://github.com/Microsoft/vscode/tree/main/extensions/html-language-features/server",
            "highlightingModeRegex": "^HTML$"
        }
    }
}