bbed source code panels on this site:</p>
            <iframe src="../tests/index.html" title="unit tests" loading="lazy"></iframe>

            <p>And for ultimate coding inception, here is that tabpanel component showing the testing source code:</p>
            <x-tab-panel>
                <x-tab title="index.html" active>
                    <x-code-viewer src="../tests/index.html" name="tests/index.html"></x-code-viewer>
                </x-tab>
                <x-tab title="index.js">
                