HTML elements. Web Components are a popular approach when building microfrontends. There are two parts to Custom Elements: autonomous custom elements and customized built-in elements. Autonomous custom elements are HTML elements that are entirely separated from native HTML elements; they are essentially built from the bottom up using the Custom Elements API. Customized built-in elements are elements that are built upon native HTML elements to reuse their functionality. The Shadow DOM is a functionality that allows the web browser to render DOM elements without putting them into the main document DOM tree. This creates a barrier between what the developer and the browser can reach; the developer cannot access the Shadow DOM in the same way they would with nested elements, while the browser can render and modify that code the same way it would with nested elements. The impact of CSS scoped within the Shadow DOM of a particular element is that HTML elements can be encapsulated without the risk of CSS styles leaking and affecting elements that they were not supposed to affect.

Although these elements are encapsulated with regard to HTML and CSS, they can still fire events that can be picked up by other elements in the document. The scoped subtree in an element is called a shadow tree. The element the shadow tree is attached to is called a shadow host. A Shadow DOM must always be connected to an existing element, either through attaching it as a literal element or through scripting. In JavaScript, Shadow DOMs are attached to an element using Element.attachShadow(). A HTML template is a way to insert chunks of HTML that are cloned from the template at will. Scripts will not run, and resources that are inside a template will not be fetched until the template is instantiated. Web Components are supported by current versions of all major browsers. Backward compatibility with older browsers is implemented using JavaScript-based polyfills. There are many libraries that are built on Web Components with the aim of increasing the level of abstraction when creating custom elements.

There are numerous community efforts for the Web Components ecosystem. Web Components standard, with a set of pending bugs and available workarounds. In 2011, Web Components were introduced for the first time by Alex Russell at Fronteers Conference. In 2013, Polymer, a library based on Web Components was released by Google. Polymer is canonical implementation of Material Design for web application user interfaces. In 2016, RequireJS was introduced as JavaScript library and AMD loader plugin for custom elements. In 2017, Ionic (mobile app framework) team built StencilJS, a JavaScript compiler that generates Web Components. In 2018, Angular 6 introduced Angular Elements that lets you package your Angular components as custom web elements, which are part of the web components set of web platform APIs. In 2018, Firefox 63 enabled Web Components support by default and updated the developer tools to support them. In 2018, LitElement was developed by the Google Chrome team as part of larger Polymer project. LitElement was designed to be a lightweight and easy-to-use framework for creating web components. MDN Web Docs. Mozilla.

One of the most important navigational tools on the Internet is the search engine. Search engines have come and gone, but most of them followed the same strategy -- using a search algorithm to scan Web pages for the user's search terms. Web page publishers figured this out pretty quickly, and soon users were browsing through irrelevant sites just because the page's owner had hidden every search term imaginable in the page's html code. Mahalo is revolutionizing search engines with a new mission -- to give users a hassle-free, informative and relevant experience. Instead of relying on a complex algorithm to generate search results, Mahalo uses human beings. Real, live people research each search term, seeking out the sites that best fit the user's request. While most search engines depend on complex algorithms developed by a small group of people, Mahalo searches are the result of hundreds of people working to sort out the absolute best of the Web. Instead, Mahalo contributors submit search results pages (SeRPs) to a centralized database, called the Mahalo Greenhouse.

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