Ben Chuanlong Du's Blog

It is never too late to learn.

Tips on HTML

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Useful Tools

HTML Table Generator


W3C Markup Validation Service

validator Nu Html Checker – Helps you catch problems in your HTML/CSS/SVG

15 Most Popular HTML Validator Online Tools In 2020

20 Free Online Tools for Validating the Code of Your Website



  1. HTML is not case sensitive, but it's suggested that you alway use lower case for tags.

  2. <!-- ... --> comment

  3. always use <!DOCTYPE>

  4. code is for verbatim code while <script> ... </script> is for scripting code that will acutally run.

  5. you'd better use percent for width when formating paragraphs and so on, this is more portable <p style="width:79%"> ... </p>

  6. it seems that figcaption in html5 cannot align correctly, must rely on div to align, but only center works perfect.

  7. no difference between double vs single quotes in HTML


W3C Standard