HTML Cheat Sheet

A quick reference guide for HTML5 tags, attributes, events, and status codes.

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Basic Structure

Document & Structure
  • <!DOCTYPE> Defines document type
  • <html> Root element
  • <head> Contains metadata
  • <title> Document title
  • <body> Visible content
  • <h1> to <h6> Headings
  • <p> Paragraph
  • <br /> Line break
  • <hr /> Horizontal rule
  • <div> Division / Section
  • <span> Inline container
Lists & Links
  • <a> Hyperlink anchor
  • <link> Resource relationship
  • <ul> Unordered list
  • <ol> Ordered list
  • <li> List item
  • <dl> Description list
  • <dt> Term name
  • <dd> Term description

Formatting

Text Formatting
  • <b> Bold text
  • <strong> Important text
  • <i> Italic text
  • <em> Emphasized text
  • <mark> Marked text
  • <small> Smaller text
  • <del> Deleted text
  • <ins> Inserted text
  • <sub> Subscript
  • <sup> Superscript
  • <blockquote> Long quotation
  • <q> Short quotation
  • <abbr> Abbreviation
  • <code> Computer code
  • <pre> Preformatted text
  • <kbd> Keyboard input

Forms & Tables

Forms
  • <form> User input form
  • <input> Input control
  • <textarea> Multiline input
  • <label> Input label
  • <fieldset> Group elements
  • <legend> Caption for fieldset
  • <select> Dropdown list
  • <option> Dropdown option
  • <button> Clickable button
Tables
  • <table> Defines a table
  • <caption> Table title
  • <th> Header cell
  • <tr> Table row
  • <td> Table cell
  • <thead> Header content
  • <tbody> Body content
  • <tfoot> Footer content

Attributes & Events

Global Attributes
  • class Stylesheet class
  • id Unique identifier
  • style Inline CSS
  • title Tooltip text
  • lang Language code
  • data-* Custom data
  • hidden Hide element
Window & Form Events
  • onload Page loaded
  • onunload Page closed
  • onsubmit Form submitted
  • onchange Value changed
  • onfocus Element focus
  • onblur Lost focus
Mouse & Keyboard
  • onclick Mouse click
  • ondblclick Double click
  • onmouseover Mouse over
  • onmouseout Mouse out
  • onkeydown Key press
  • onkeyup Key release

HTML Entities

Special Characters
CharEntity NameEntity NumberDescription
"&quot;&#34;Double Quote
'&apos;&#39;Single Quote
&&amp;&#38;Ampersand
<&lt;&#60;Less Than
>&gt;&#62;Greater Than
&nbsp;&#160;Non-breaking Space
©&copy;&#169;Copyright
™&trade;&#8482;Trademark
€&euro;&#8364;Euro

HTTP Status Codes

2XX & 3XX (Success/Redirect)
  • 200 OK Standard success
  • 201 Created Resource created
  • 204 No Content Success, no body
  • 301 Moved Permanent redirect
  • 302 Found Temporary redirect
  • 304 Not Modified Cached version
4XX & 5XX (Errors)
  • 400 Bad Request Invalid syntax
  • 401 Unauthorized Auth required
  • 403 Forbidden Access denied
  • 404 Not Found Missing resource
  • 500 Internal Error Server crash
  • 502 Bad Gateway Invalid upstream
  • 503 Unavailable Overloaded/Down
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