CodePrimer
Search a living directory of web syntax. Pick a problem, copy a working sample, then adapt it.
PHP
Beginner
echo vs print
Should I use echo or print?
HTML
Beginner
Ordered and unordered lists
How do I make bullet or numbered lists?
JavaScript
Beginner
Arrow function event listener
Can I use an arrow function for events?
CSS
Intermediate
CSS position values
How do I pin an element or overlap layers?
HTML
Beginner
HTML table structure
How do I display tabular data?
SQL
Beginner
LIKE search pattern
How do I search text with a keyword?
PHP
Beginner
PHP scalar data types
What data types does PHP have?
SQL
Advanced
Basic transaction
How do I commit or roll back multiple writes?
CSS
Beginner
CSS custom properties
How do I reuse colors with variables?
PHP
Beginner
Debug with var_dump
How do I inspect a variable’s type?
HTML
Beginner
Image with alt text
How do I insert an image accessibly?
JavaScript
Beginner
Live input event
How do I react as the user types?
JavaScript
Beginner
change event on select
How do I detect dropdown changes?
HTML
Beginner
Charset and viewport meta
Why does mobile layout look wrong?
PHP
Beginner
Common PHP string functions
How do I count, reverse, or replace text?
CSS
Beginner
Hover and focus-visible
How do I style hover and keyboard focus?
SQL
Beginner
WHERE with AND / OR
How do I combine filters in SQL?
CSS
Beginner
Class vs ID selectors
Should I style with classes or IDs?