Since the first time I heard about HTML5 and CSS3, I have been exploring them very keenly. At the same time, I have been trying to re-educate my clients but that has not been so easy. It is sad that most clients still ask for the following:
1. Validate HTML as Strict or Transitional.
2. Validate CSS.
3. Make the website meet Accessibility Level 2+.
4. Make it look the same across all browsers.