Throughout this tutorial we will be using Google's Chrome which is by far the most popular browser by market share. However, all recent browsers (Safari, Firefox, Edge etc.) can similarly be used to inspect, edit and modify CSS styles. The screenshots show Chrome Version 91 on macOS Catalina. For this example, we'll stick with our own page, but you We begin by loading a website into Chrome. The context menu contains a command, "Inspect": The quickest way to actually inspect an element is by right-clicking while the mouse pointer is over the element here we right-click while hovering over the headline "Mac Barcode Software". Selecting the Inspect command opens Chrome's "Developer Tools" in the right half of the browser window. Next to the styles Chrome shows the file and line number where the styles are declared clicking the filename opens the respective stylesheet in a panel (You can also see the individual files when clicking the Sources tab in the top most toolbar.) Changing headline text color style The bottom panel displays the styles that are currently applied to the headline, listing the font, font attributes, color and other styles: The top panel shows the HTML elements of the page, with the h1 headline above highlighted. Chrome will now display a standard color picker, preset to the current color of the h1 headline, #555555: Let's change the text color of the headline: Click the little gray square right to the tag color. Text is now displayed in blue, likewise the color tag and preview square in the style declaration are updated with the new color value: Select another color, for example blue, in the picker and hit to dismiss the picker. It's important to note that this style change is only applied to the loaded page within the browser it is not stored or written to the stylesheet. As soon as you reload the page, the original style will be used again and all changes will be lost. Try changing other values, like the font, the border or the line spacing. You can also add style rules by clicking the "+" button in the toolbar directly above the declarations. Activating and deactivating cascading style definitions Besides by reloading, style changes in the developer tools can also be undone using the common shortcuts ⌘ + Z (Mac) and Ctrl + Z (PC). You will notice that some styles in the lower panel are struck out with a horizontal line through the text. For example, the font size for h1 is defined in as 36px, but is shown as font-size: 36px. Our site imports two stylesheets, and starter-template.css and both define a font size for h1. However, the starter-template.css is loaded after so the style definition in the second file ( font-size: 20pt ) takes preference over the style as defined in the first file. This is called cascading and this is where CSS got it's name from (for more on cascading, see this). If you skipped the Introduction, we strongly recommend reading it before moving on to the rest of the documentation.By striking out the declaration from, Chrome tells us that this style has been overridden and is currently not applied to the element.Ĭhrome allows us to disable style definitions by simply deselecting them. If you are using VSCode, you can install the es6-string-html extension and prefix the strings with a /*html*/ comment to get syntax highlighting for them. You may have noticed that the imported component's template is inlined as a JavaScript string. You can also use any other HTTP server that can serve static files with the correct MIME types. To start a local HTTP server, first make sure you have Node.js installed, then run npx serve from the command line in the same directory where your HTML file is. In order for ES modules to work on our local machine, we need to serve the index.html over the protocol, with a local HTTP server. If you directly open the above index.html in your browser, you will find that it throws an error because ES modules cannot work over the file:// protocol, which is the protocol the browser uses when you open a local file.ĭue to security reasons, ES modules can only work over the protocol, which is what the browsers uses when opening pages on the web.
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