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CodePrimer

Search a living directory of web syntax. Pick a problem, copy a working sample, then adapt it.

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Tags basics 48 php 45 javascript 24 html 23 css 18 dom 18 forms 16 database 14 layout 8 sql 7 events 6 arrays 6 pdo 6 http 5 control-flow 5 a11y 5 security 4 responsive 3 components 3 media 3 flexbox 3 functions 2 auth 2 selectors 2

48 snippets

PHP Beginner

Embed PHP inside HTML

How do I mix PHP and HTML?

Basics basics php
HTML Beginner

HTML headings h1–h6

How do I create page headings?

Basics html basics
CSS Beginner

Three ways to apply CSS

What are inline, internal, and external CSS?

Basics basics css
CSS Beginner

CSS box model

Why is my element wider than expected?

Layout basics css layout
HTML Beginner

Paragraphs and line breaks

How do I break text into paragraphs?

Basics html basics
PHP Beginner

PHP comments

How do I write comments in PHP?

Basics basics php
HTML Beginner

Hyperlinks with href

How do I make a clickable link?

Basics html basics navigation
PHP Beginner

PHP variable rules

What are the rules for PHP variables?

Basics basics php
PHP Beginner

echo vs print

Should I use echo or print?

Basics basics php
HTML Beginner

Ordered and unordered lists

How do I make bullet or numbered lists?

Basics html basics
HTML Beginner

HTML table structure

How do I display tabular data?

Basics html basics tables
PHP Beginner

PHP scalar data types

What data types does PHP have?

Basics basics php
CSS Beginner

CSS custom properties

How do I reuse colors with variables?

Basics basics css
HTML Beginner

Charset and viewport meta

Why does mobile layout look wrong?

Basics html basics responsive
PHP Beginner

Common PHP string functions

How do I count, reverse, or replace text?

Basics basics php strings
HTML Beginner

Link an external CSS file

How do I attach a stylesheet?

Basics html basics css
PHP Beginner

PHP math helpers

How do I do min/max/round/random in PHP?

Basics basics php
HTML Beginner

Include JS with defer

How do I add JavaScript to a page?

Basics html basics javascript

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