Learn the essential rules for valid HTML ID attributes including character requirements, naming conventions, and best practices. Ensure proper functionality across browsers and technologies with our comprehensive guide.
Learn how to style parent elements based on child states using CSS :has(), JavaScript solutions, and alternative workarounds for browser compatibility.
Learn why CSS :first-child selector fails to target first elements with specific classes and discover multiple solutions including :nth-child(1 of .red), :first-of-type, and JavaScript approaches. Fix your CSS selectors today!