HTML5 Canvas Context Attributes

Each HTML5 Canvas context contains attributes that can be modified by JavaScript code. Note that attributes are assigned to Canvas contexts, not individual Canvas objects. Attributes for a context are referenced using dot syntax notation. Here is an example: contextName.fillStyle="red". The following attributes show default and other optional values:

fillStyle "black"  
 
font "10px sans-serif"
 
globalAlpha 1.0

    Comment: Values shown after attributes are defaults

globalCompositeOperation "source-over"

    Comment: Other compositions are

       "source-in", "source-out", "source-atop",
       "destination-over", "destination-in",
       "destination-out", "destination-atop", "lighter",
       "copy", "xor"
 
lineCap "butt"

    Comment: Other caps are "round" and "square".

lineJoin "miter"

    Comment: Other joins are "round" and "bevel".

lineWidth 1.0
 
miterLimit 10.0
 
shadowColor "transparent black"

    Comment: Other colors include wide variety

shadowBlur 0.0
 
shadowOffsetX 0.0
 
shadowOffsetY 0.0
 
strokeStyle "black"

    Comment: Other colors include wide variety

textAlign "start"

    Comment: Other alignments are

       "end", "left", "right", "center"
 
textBaseline "alphabetic"

    Comment: Other baselines are

       "top", "hanging", "middle", "ideographic", "bottom"

Web Design & Development Glossary

AJAX

asynchronous JavaScript and XML. A technique used in web page development.

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API

application programming interface. A set of rules programs use to communicate with each other.

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color stop

A special element that indicates a color to be added to a gradient.

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FTP

File Transfer Protocol. A network protocol useful for transferring files in a client-server relationship.

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HTML

HyperText Markup Language. The predominant language for building web pages.

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HTTP

HyperText Transfer Protocol. The primary networking language for the Internet.

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PHP

PHP Hypertext Processor. A scripting language that works well within HTML.

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socket

A technology that allows remote computers to maintain a persistent connection in order to communicate with each other.

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sprite

An graphic object on a web page that will be manipulated in real time.

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SQL

Structured Query Language. A programming language useful in managing relational databases.

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stateless protocol

An Internet procedure that completely breaks the connection between the client and the server after a transaction, meaning that the next transaction will require an entirely new connection.

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Telnet

A network protocol useful in interactive, text-oriented communications.

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W3C

World Wide Web Consortium. The organization that sets international standards for the World Wide Web.