In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.

New phishing campaigns attempt to evade detection by constructing rogue QR codes with special ASCII characters and load phishing pages locally using the local blob URL feature in browsers.

Learn how to use HTML tags to structure web pages, improve SEO, and create better user experiences.

Google's John Mueller advises using semantic HTML. Though not a ranking factor, it helps search engines understand content and boosts accessibility.