If you know HTML, you can look at the code and figure out what the editor did and, if necessary, change it. Notepad, Word, or Pico or VI on Unix. Some elements, called empty elements, don't require an end tag because they don't enclose content. An HTML start tag can sometimes contain attributes that modify the element's meaning Elements and attributes are not case sensitive, but attribute values might be. Element names cannot contain spaces.
Browsers ignore space characters in HTML content.
Browsers ignore unknown elements and attributes Browser Issues Different browsers and versions of the same browser render code differently. Therefore it's important to check your work in various browsers if usability and access are of concern. Word Wrap Begin your HTML document by adding the basic tags as seen above. You can indent or not. Case doesn't matter.