CodePrimer
Search a living directory of web syntax. Pick a problem, copy a working sample, then adapt it.
JavaScript
Beginner
innerHTML vs textContent
How do I change an element’s text?
HTML
Beginner
Link an external CSS file
How do I attach a stylesheet?
PHP
Beginner
PHP math helpers
How do I do min/max/round/random in PHP?
CSS
Beginner
Flex row with gap
How do I put items in a horizontal row?
HTML
Beginner
Include JS with defer
How do I add JavaScript to a page?
PHP
Beginner
PHP type casting
How do I cast a value to another type?
JavaScript
Beginner
setAttribute and style
How do I change attributes and CSS from JS?
JavaScript
Beginner
classList toggle
How do I toggle a CSS class?
HTML
Beginner
div vs span
When do I use div or span?
CSS
Beginner
Flex wrap responsive chips
How do flex items wrap on small screens?
PHP
Beginner
PHP arithmetic operators
What are PHP math operators?
JavaScript
Beginner
createElement and appendChild
How do I add a new element with JS?
PHP
Beginner
PHP comparison operators
What is == vs === in PHP?
HTML
Beginner
Radio button group
How do I let users pick only one option?
CSS
Intermediate
Responsive card grid
How do I make cards auto-fit columns?
HTML
Beginner
Checkboxes as PHP arrays
How do I submit multiple checkboxes to PHP?
PHP
Beginner
PHP logical operators
How do I combine conditions?
JavaScript
Beginner
Remove a DOM node
How do I delete an element?