Subject
Grade
Concept/Content
World Wide Web Consortium (W3C) standards and responsive and optimized web design
Elaboration
using online World Standards Cooperation (WSC) validators to check for any errors in the HTML and cascading style sheets (CSS)
consideration of how content will be displayed across multiple devices, cross-browser compatibility
for speed of loading, minimal bandwidth requirements, and appropriate image compression types (jpg, gif, png)
keywords
W3C
responsive
optimized