Facing the Past and Future of HTML5

By now, you have learned about HTML5 and had to think of older HTML versions only tangentially.

In real life, you often meet old HTML dialects, including XHTML and other old HTML versions.

However, they are very close to HTML5 you learned in this book, but they may use HTML elements and attributes you do not know yet. On the other hand, HTML5 defines new elements that are not supported by all browsers, or not fully, but partially.

Old HTML dialects

At the very beginning of your first exercises, you met the <!DOCTYPE> tag that instructs the web browser about the version of HTML the page is written in. Since that, you have ...