<h1> - Opening heading tag, </h1> - Closing heading tag, <p> - Opening paragraph tag, </p> - Closing paragraph tag, main.css - Cascading Style Sheet (CSS), .html - The extension for HTML files, .css - The extension for CSS files, CSS selector - selects the HTML elements to apply style to., CSS style - gives the property and value styles to apply, CSS rule - The selector and styles together., CSS rel - short for relationship - link to stylesheet, CSS href - the location of the stylesheet, the file name, text-align - Some values are left, right, and center., line height - sets the space there is between lines of text., width - property sets how wide an element is., em - (short for emphasis) - text leans to the right., strong - element used for emphasis, <br> - Line break to start a new line, <span> - Groups text inside an element , img - Image element, src - Source - the filename for the element, alt - The text that appears if the image file is missing,

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