<ul><li>Custom elements can suffer from FOUC where they appear as generic HTML elements before their structure and styles are applied.</li><li>One method to avoid FOUC is by hiding unregistered custom elements using CSS until they are registered.</li><li>To ensure custom elements work before the DOM is parsed, use Lifecycle Callbacks like connectedCallback.</li><li>By connecting the logic to Lifecycle Callbacks, custom elements can be configured before DOM parsing, preventing FOUC.</li><li>Prioritizing loading of above-the-fold elements and deferring others can improve rendering performance.</li><li>Declarative Shadow DOM can help avoid additional HTTP requests for rendering optimizations.</li><li>Sharing styles between Shadow Roots can be achieved by including a link to a stylesheet or adopting stylesheets inline.</li><li>Web Components offer versatile tools to encapsulate structure and styles, making it easier to create production-ready components.</li><li>Experimenting with advanced techniques in Web Components can lead to creating polished, production-ready components.</li><li>Continued exploration and refinement can help in developing robust, plug-and-play Web Component toolkits.</li></ul>

Shining a Light on Shadow DOM

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