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The interpretation by the browser’s rendering engine is where your headaches begin. The W3C has gone to great lengths to create specifications by which browser developers should render the Web code. Nonetheless, bugs, omissions, and misinterpretations still creep in, meaning that no two browsers will render a Web page in exactly the same way. For the most part, these differences go unnoticed by most users, but occasionally the differences are glaring and require that you do some extra work to get the page to look right with the broadest spectrum of browsers.

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browser CSS extensions In addition to supporting the specified CSS properties set by the W3C, a browser developer will occasionally introduce browser-specific properties. This is often done for one of two reasons: n A spec is still under development by the W3C but the browser developer wants to start using the style now. The browser developer wants to try a new idea but doesn't want to wait for the W3C to accept it and begin work on it, which can take years.

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I added some css to my theme to support layout builder, I disabled the match height javascript if the layout builder activated and I disabled the javascript for Show Block on Scroll.

https://www.drupal.org/project/d8w3css/issues/3175022

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How does CSS work? When a visitor loads one of your Web pages, by either typing in the address or clicking a link, the server (the computer that stores the Web page) sends the HTML file to the visitor’s computer along with any files linked to or embedded in the HTML file. Regardless of where the CSS code is, the visitor’s browser will interpret it and apply it to the HTML to render the Web page using that browser’s particular rendering engine that is then displayed in the browser window.

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The margin of an element allows you to set the space between that element and other elements in the window by specifying one to four values that correspond to all four sides together, the top/ bottom and left/right sides as pairs, or all four sides independently. To define the margins of an element: 1. Start your declaration by typing the margin shortcut property name in the declaration block, followed by a colon (:) margin: 2. Type a value for the margin.

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1. Add content to your HTML file. Using the HTML file you created in chapter 2, add text and image content. I tend to use Alice’s Adventures in Wonderland, but anything will do. A great source for text is Project Guttenberg (www.gutenberg. org). 2. Markup your content. All styles require markup in the Web page to give them something to be applied to. Make sure to tag headers and paragraphs. 3. Add classes and IDs to your markup. Classes give you a “hook” to apply specific styles to specific elements. Don’t go overboard, though.