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.

How to Inject Attributes Into Code Using PHP. HTML is a markup language rather than a programming language. You can specify how you want text to appear on a Web page with HTML, but you can't make ...

How to Use HTML in Thunderbird. Thunderbird is Mozilla's free, open-source email client, capable of sending rich-text messages by using HTML. When you open a Thunderbird message, it operates like ...

Search Engine Land's Guide to SEO Chapter 3: HTML Code & Search Engine Ranking Success Factors explains HTML elements & using structured data.