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<!DOCTYPE html><html lang="ja"><head><meta charset="utf-8">
<title>HTML Standard — canvas 要素（日本語訳）</title>
<link rel="stylesheet" href="common.css" type="text/css">
<link rel="stylesheet" href="common-whatwg.css" type="text/css">
<style>
.type {
font-family: monospace0, monospace;
}
.baseline {
font-family: sans-serif0, sans-serif;
}
._ex-matrix {
white-space: pre;
margin-left: 2em;
padding: 0 0.3em;
display: inline-block;
border: thin solid currentcolor;
border-style: none solid;
border-radius: 5px;
}
@supports (grid-template-columns: subgrid) and (display: contents) {
#_ex-premultiplied {
grid-template-columns: 15em 1fr 8em;
max-width: 40em;
tr {
grid-template-areas:
"CSS 記述 画像"
"乗算済み 記述 画像"
"非乗算済み 記述 画像"
;
> *:nth-child(1) {
grid-area: CSS;
}
> *:nth-child(2) {
grid-area: 乗算済み;
}
> *:nth-child(3) {
grid-area: 非乗算済み;
}
> *:nth-child(4) {
grid-area: 記述;
}
> *:nth-child(5) {
grid-area: 画像;
}
}
}
}
</style>
<script src="common0.js"></script>
<script src="common1.js" async></script>
<script>
Util.ready = function(){
const source_data = {
toc_main: 'MAIN',
generate: expand
};
Util.switchWordsInit(source_data);
}
function expand(){
const class_map = this.class_map;
const tag_map = this.tag_map;
const link_map = this.link_map;
return this.html.replace(
/%[\w\-~一-鿆あ-ん]+|`(.+?)([$@\^])(\w*)/g,
create_html
);
function create_html(match, key, indicator, klass){
if(!key) { //%
return `<var>${match.slice(1)}</var>`;
}
let href = '';
let href1 = '';
{
const n = key.indexOf('＠');
if(n > 0) {
href1 = key.slice(n + 1);
key = key.slice(0, n);
}
}
let text = key;
switch(klass){
case 'r':
text = `[${key}]`;
href = `HTML-references.html#refs${key}`;
break;
case 'mt': // media type
case 'l': // literal
case 'cC':
text = `"<code class="literal">${text}</code>"`;
break;
case 'm': // IDL member
case '2d':
case '2d1':
case 'iD':
case 'tM':
case 'oC':
case 'o2d':
const n = text.indexOf('(');
if(n > 0){
key = text.slice(0, n);
text = key + text.slice(n).replace(/\w+/g, '<var>$&</var>');
}
break;
case 'sl': // JS internal slot
text = `[[${text}]]`;
break;
case 'U':
text = `U+${key}`;
break;
case 't':
text = `<${key}>`;
break;
case 'at':
text = `@${key}`;
break;
case 'en':
return `<span lang="en">${key}</span>`;
break;
case 'dgm':
return `<a id="_dgm-${key}"></a>`;
break;
}
let tag = tag_map[klass];
if(tag) {
let classname = class_map[klass];
classname = classname ? ` class="${classname}"` : '';
text = `<${tag}${classname}>${text}</${tag}>`;
}
if(indicator !== '^'){
href = href1 || link_map[ klass ? `${klass}.${key}` : key ] || href;
if(!href){
console.log(match); // check error
return match;
}
switch(indicator){
case '$':
text = `<a href="${href}">${text}</a>`;
break;
case '@':
text = `<dfn id="${href.slice(1)}">${text}</dfn>`;
break;
}
}
return text;
}
}
</script>
<script type="text/plain" id="_source_data">
●●options
spec_date:2025-11-24
trans_update:2025-11-24
source_checked:240712
page_state_key:HTML
spec_status:LS
original_url:https://html.spec.whatwg.org/multipage/canvas.html
abbr_url:HEcanvas
nav_prev:HEscripting
nav_next:HEcustom
trans_1st_pub:2019-11-03
●●class_map
e:element
a:attr
diM:attr
et:event-type
E:error
p:property
t:type
v:value
U:code-point
at:css
css:css
u:css
bL:baseline
st:attr-state
sl:js-slot
jA:abstract
jv:js-value
jt:js-type
op:op
●●tag_map
I:code
m:code
mb:code
et:code
2d:code
2d1:code
iD:code
tM:code
oC:code
o2d:code
E:code
c:code
e:code
diM:code
a:code
U:span
st:i
sl:span
op:span
p:code
at:code
css:code
u:css
t:var
bL:span
v:code
jA:span
jv:code
jt:code
oM:i
cM:i
i:i
em:em
V:var
cite:cite
●●original_id_map
dom-context-2d-drawfocusifneeded:dom-context-2d-drawosfocusring
the-script-element:script
●●mdn_urls
the-canvas-element:HTML/Element/canvas
blobcallback:API/BlobCallback
canvascompositing:API/CanvasCompositing
canvasdirection:API/CanvasDirection
canvasdrawimage:API/CanvasDrawImage
canvasdrawpath:API/CanvasDrawPath
canvasfillrule:API/CanvasFillRule
canvasfillstrokestyles:API/CanvasFillStrokeStyles
canvasfilters:API/CanvasFilters
canvasgradient:API/CanvasGradient
canvasimagedata:API/CanvasImageData
canvasimagesmoothing:API/CanvasImageSmoothing
canvasimagesource:API/CanvasImageSource
canvaslinecap:API/CanvasLineCap
canvaslinejoin:API/CanvasLineJoin
canvaspath:API/CanvasPath
canvaspathdrawingstyles:API/CanvasPathDrawingStyles
canvaspattern:API/CanvasPattern
canvasrect:API/CanvasRect
canvasrenderingcontext2d:API/CanvasRenderingContext2D
canvasrenderingcontext2dsettings:API/CanvasRenderingContext2DSettings
canvasshadowstyles:API/CanvasShadowStyles
canvasstate:API/CanvasState
canvassettings:API/CanvasSettings
canvastext:API/CanvasText
canvastextalign:API/CanvasTextAlign
canvastextbaseline:API/CanvasTextBaseline
canvastextdrawingstyles:API/CanvasTextDrawingStyles
canvastransform:API/CanvasTransform
canvasuserinterface:API/CanvasUserInterface
canvasfontkerning:API/CanvasFontKerning
canvasfontstretch:API/CanvasFontStretch
canvasfontvariantcaps:API/CanvasFontVariantCaps
canvastextrendering:API/CanvasTextRendering
htmlcanvaselement:API/HTMLCanvasElement
htmlorsvgimageelement:API/HTMLOrSVGImageElement
imagebitmaprenderingcontext:API/ImageBitmapRenderingContext
imagebitmaprenderingcontextsettings:API/ImageBitmapRenderingContextSettings
imageencodeoptions:API/ImageEncodeOptions
imagesmoothingquality:API/ImageSmoothingQuality
offscreencanvas:API/OffscreenCanvas
offscreencanvasrenderingcontext2d:API/OffscreenCanvasRenderingContext2D
offscreenrenderingcontext:API/OffscreenRenderingContext
offscreenrenderingcontextid:API/OffscreenRenderingContextId
path2d:API/Path2D
renderingcontext:API/RenderingContext
textmetrics:API/TextMetrics
●●link_map
●IDL
LegacyNullToEmptyString:~WEBIDLjs#LegacyNullToEmptyString
Transferable:~HTMLcloning#transferable
CEReactions:~HEcustom#cereactions
HTMLConstructor:~HTMLdom#htmlconstructor
c.object:~WEBIDL#idl-object
c.unrestricted double:~WEBIDL#idl-unrestricted-double
Promise:~WEBIDL#idl-promise
I.ArrayBuffer:~WEBIDL#idl-ArrayBuffer
E.RangeError:~TC39#sec-native-error-types-used-in-this-standard-rangeerror
E.EncodingError:~WEBIDL#encodingerror
I.DOMException:~WEBIDL#idl-DOMException
E.IndexSizeError:~WEBIDL#indexsizeerror
E.InvalidStateError:~WEBIDL#invalidstateerror
E.SecurityError:~WEBIDL#securityerror
E.SyntaxError:~WEBIDL#syntaxerror
I.Blob:~FILEAPI#blob
#dfn-Blob
I.BlobCallback:#blobcallback
I.CanvasColorType:#canvascolortype
I.CanvasCompositing:#canvascompositing
I.CanvasDirection:#canvasdirection
I.CanvasDrawImage:#canvasdrawimage
I.CanvasDrawPath:#canvasdrawpath
I.CanvasFillRule:#canvasfillrule
I.CanvasFillStrokeStyles:#canvasfillstrokestyles
I.CanvasFilters:#canvasfilters
I.CanvasGradient:#canvasgradient
I.CanvasImageData:#canvasimagedata
I.CanvasImageSmoothing:#canvasimagesmoothing
I.CanvasImageSource:#canvasimagesource
I.CanvasLineCap:#canvaslinecap
I.CanvasLineJoin:#canvaslinejoin
I.CanvasPath:#canvaspath
I.CanvasPathDrawingStyles:#canvaspathdrawingstyles
I.CanvasPattern:#canvaspattern
I.CanvasRect:#canvasrect
I.CanvasRenderingContext2D:#canvasrenderingcontext2d
I.CanvasRenderingContext2DSettings:#canvasrenderingcontext2dsettings
I.CanvasShadowStyles:#canvasshadowstyles
I.CanvasSettings:#canvassettings
I.CanvasState:#canvasstate
I.CanvasText:#canvastext
I.CanvasTextAlign:#canvastextalign
I.CanvasTextBaseline:#canvastextbaseline
I.CanvasTextDrawingStyles:#canvastextdrawingstyles
I.CanvasTransform:#canvastransform
I.CanvasUserInterface:#canvasuserinterface
I.CanvasFontKerning:#canvasfontkerning
I.CanvasFontStretch:#canvasfontstretch
I.CanvasFontVariantCaps:#canvasfontvariantcaps
I.CanvasTextRendering:#canvastextrendering
I.PredefinedColorSpace:#predefinedcolorspace
I.DOMMatrix:~GEOMETRY#dommatrix
I.DOMMatrix2DInit:~GEOMETRY#dictdef-dommatrix2dinit
I.DOMPointInit:~GEOMETRY#dictdef-dompointinit
I.Document:~HTMLdom#document
文書:~HTMLdom#the-document-object
~node文書:~DOM4#concept-node-document
I.Element:~DOM4#interface-element
I.EventTarget:~DOM4#interface-eventtarget
I.EventHandler:~WAPI#eventhandler
I.Window:~WINDOW#window
I.WorkerGlobalScope:~WORKERS#workerglobalscope
I.FontFace:~CSSFONTLOADING#fontface
infrastructure.html#fontface
I.HTMLCanvasElement:#htmlcanvaselement
I.HTMLElement:~HTMLdom#htmlelement
I.HTMLImageElement:~HEimages#htmlimageelement
I.HTMLOrSVGImageElement:#htmlorsvgimageelement
I.HTMLVideoElement:~HEmedia#htmlvideoelement
I.ImageBitmap:~HTMLGAPI#imagebitmap
I.ImageBitmapRenderingContext:#imagebitmaprenderingcontext
I.ImageBitmapRenderingContextSettings:#imagebitmaprenderingcontextsettings
I.ImageBitmapSource:~HTMLGAPI#imagebitmapsource
I.ImageData:~HTMLGAPI#imagedata
I.ImageDataSettings:~HTMLGAPI#imagedatasettings
I.ImageEncodeOptions:#imageencodeoptions
I.ImageSmoothingQuality:#imagesmoothingquality
I.OffscreenCanvas:#offscreencanvas
I.OffscreenCanvasRenderingContext2D:#offscreencanvasrenderingcontext2d
I.OffscreenRenderingContext:#offscreenrenderingcontext
I.OffscreenRenderingContextId:#offscreenrenderingcontextid
I.Path2D:#path2d
I.RenderingContext:#renderingcontext
I.SVGImageElement:~SVGembedded#InterfaceSVGImageElement
I.TextMetrics:#textmetrics
I.WebGLRenderingContext:~WEBGL/1.0/#WebGLRenderingContext
I.WebGL2RenderingContext:~WEBGL/2.0/#WebGL2RenderingContext
I.GPUCanvasContext:~WEBGPU#canvas-context
I.VideoFrame:~WEBCODECS#videoframe-interface
m.preserveDrawingBuffer:~WEBGL/1.0/#WebGLContextAttributes
m.new FontFace:~CSSFONTLOADING#dom-fontface-fontface
2d.arc:#dom-context-2d-arc
2d.arcTo:#dom-context-2d-arcto
2d.beginPath:#dom-context-2d-beginpath
2d.bezierCurveTo:#dom-context-2d-beziercurveto
2d.canvas:#dom-context-2d-canvas
2d.clearRect:#dom-context-2d-clearrect
2d.clip:#dom-context-2d-clip
2d1.clip:#dom-context-2d-clip-path
2d.closePath:#dom-context-2d-closepath
2d.createImageData:#dom-context-2d-createimagedata
2d1.createImageData:#dom-context-2d-createimagedata-imagedata
2d.createLinearGradient:#dom-context-2d-createlineargradient
2d.createPattern:#dom-context-2d-createpattern
2d.createRadialGradient:#dom-context-2d-createradialgradient
2d.createConicGradient:#dom-context-2d-createconicgradient
2d.direction:#dom-context-2d-direction
2d.drawFocusIfNeeded:#dom-context-2d-drawfocusifneeded
2d1.drawFocusIfNeeded:#dom-context-2d-drawfocusifneeded-path-element
2d.drawImage:#dom-context-2d-drawimage
2d.ellipse:#dom-context-2d-ellipse
2d.fill:#dom-context-2d-fill
2d1.fill:#dom-context-2d-fill-path
2d.fillRect:#dom-context-2d-fillrect
2d.fillStyle:#dom-context-2d-fillstyle
2d.fillText:#dom-context-2d-filltext
2d.filter:#dom-context-2d-filter
2d.font:#dom-context-2d-font
2d.getContextAttributes:#dom-context-2d-canvas-getcontextattributes
2d.getImageData:#dom-context-2d-getimagedata
2d.getLineDash:#dom-context-2d-getlinedash
2d.getTransform:#dom-context-2d-gettransform
2d.globalAlpha:#dom-context-2d-globalalpha
2d.globalCompositeOperation:#dom-context-2d-globalcompositeoperation
2d.imageSmoothingEnabled:#dom-context-2d-imagesmoothingenabled
2d.imageSmoothingQuality:#dom-context-2d-imagesmoothingquality
2d.isContextLost:#dom-context-2d-iscontextlost
2d.isPointInPath:#dom-context-2d-ispointinpath
2d1.isPointInPath:#dom-context-2d-ispointinpath-path
2d.isPointInStroke:#dom-context-2d-ispointinstroke
2d1.isPointInStroke:#dom-context-2d-ispointinstroke-path
2d.lang:#dom-context-2d-lang
2d.lineCap:#dom-context-2d-linecap
2d.lineDashOffset:#dom-context-2d-linedashoffset
2d.lineJoin:#dom-context-2d-linejoin
2d.lineTo:#dom-context-2d-lineto
2d.lineWidth:#dom-context-2d-linewidth
2d.measureText:#dom-context-2d-measuretext
2d.miterLimit:#dom-context-2d-miterlimit
2d.moveTo:#dom-context-2d-moveto
2d.putImageData:#dom-context-2d-putimagedata
2d1.putImageData:#dom-context-2d-putimagedata-short
2d.quadraticCurveTo:#dom-context-2d-quadraticcurveto
2d.rect:#dom-context-2d-rect
2d.resetTransform:#dom-context-2d-resettransform
2d.reset:#dom-context-2d-reset
2d.restore:#dom-context-2d-restore
2d.rotate:#dom-context-2d-rotate
2d.roundRect:#dom-context-2d-roundrect
2d.save:#dom-context-2d-save
2d.scale:#dom-context-2d-scale
2d.setLineDash:#dom-context-2d-setlinedash
2d.setTransform:#dom-context-2d-settransform
2d1.setTransform:#dom-context-2d-settransform-matrix
2d.shadowBlur:#dom-context-2d-shadowblur
2d.shadowColor:#dom-context-2d-shadowcolor
2d.shadowOffsetX:#dom-context-2d-shadowoffsetx
2d.shadowOffsetY:#dom-context-2d-shadowoffsety
2d.stroke:#dom-context-2d-stroke
2d1.stroke:#dom-context-2d-stroke-path
2d.strokeRect:#dom-context-2d-strokerect
2d.strokeStyle:#dom-context-2d-strokestyle
2d.strokeText:#dom-context-2d-stroketext
2d.textAlign:#dom-context-2d-textalign
2d.textBaseline:#dom-context-2d-textbaseline
2d.transform:#dom-context-2d-transform
2d.translate:#dom-context-2d-translate
2d.letterSpacing:#dom-context-2d-letterspacing
2d.wordSpacing:#dom-context-2d-wordspacing
2d.fontKerning:#dom-context-2d-fontkerning
2d.fontStretch:#dom-context-2d-fontstretch
2d.fontVariantCaps:#dom-context-2d-fontvariantcaps
2d.textRendering:#dom-context-2d-textrendering
iD.data:~HTMLGAPI#dom-imagedata-data
iD.height:~HTMLGAPI#dom-imagedata-height
iD.width:~HTMLGAPI#dom-imagedata-width
iD.colorSpace:~HTMLGAPI#dom-imagedata-colorspace
iD.pixelFormat:~HTMLGAPI#dom-imagedata-pixelformat
tM.width:#dom-textmetrics-width
tM.actualBoundingBoxLeft:#dom-textmetrics-actualboundingboxleft
tM.actualBoundingBoxRight:#dom-textmetrics-actualboundingboxright
tM.fontBoundingBoxAscent:#dom-textmetrics-fontboundingboxascent
tM.fontBoundingBoxDescent:#dom-textmetrics-fontboundingboxdescent
tM.actualBoundingBoxAscent:#dom-textmetrics-actualboundingboxascent
tM.actualBoundingBoxDescent:#dom-textmetrics-actualboundingboxdescent
tM.emHeightAscent:#dom-textmetrics-emheightascent
tM.emHeightDescent:#dom-textmetrics-emheightdescent
tM.hangingBaseline:#dom-textmetrics-hangingbaseline
tM.alphabeticBaseline:#dom-textmetrics-alphabeticbaseline
tM.ideographicBaseline:#dom-textmetrics-ideographicbaseline
oC.new OffscreenCanvas:#dom-offscreencanvas
constructor:#dom-offscreencanvas
oC.convertToBlob:#dom-offscreencanvas-converttoblob
oC.getContext:#dom-offscreencanvas-getcontext
oC.transferToImageBitmap:#dom-offscreencanvas-transfertoimagebitmap
oC.height:#dom-offscreencanvas-height
oC.width:#dom-offscreencanvas-width
o2d.canvas:#offscreencontext2d-canvas
m.oncontextlost:#handler-offscreencanvas-oncontextlost
m.oncontextrestored:#handler-offscreencanvas-oncontextrestored
m.setTransform:#dom-canvaspattern-settransform
m.addColorStop:#dom-canvasgradient-addcolorstop
m.addPath:#dom-path2d-addpath
m.new Path2D:#dom-path2d
constructor:#dom-path2d
m.createImageBitmap:~HTMLGAPI#dom-createimagebitmap
m.focus:~HTMLinteraction#dom-focus
m.getContext:#dom-canvas-getcontext
m.toBlob:#dom-canvas-toblob
m.toDataURL:#dom-canvas-todataurl
m.transferControlToOffscreen:#dom-canvas-transfercontroltooffscreen
m.height:#dom-canvas-height
m.width:#dom-canvas-width
m.HAVE_METADATA:~HEmedia#dom-media-have_metadata
m.HAVE_NOTHING:~HEmedia#dom-media-have_nothing
m.readyState:~HEmedia#dom-media-readystate
m.transferFromImageBitmap:#dom-imagebitmaprenderingcontext-transferfromimagebitmap
m.canvas:#dom-imagebitmaprenderingcontext-canvas
mb.alpha:#dom-canvasrenderingcontext2dsettings-alpha
mb.willReadFrequently:#dom-canvasrenderingcontext2dsettings-willreadfrequently
mb.desynchronized:#dom-canvasrenderingcontext2dsettings-desynchronized
mb.colorSpace:#dom-canvasrenderingcontext2dsettings-colorspace
mb.colorType:#dom-canvasrenderingcontext2dsettings-colortype
＠~HTMLGAPI#dom-imagedatasettings-colorspace
＠~HTMLGAPI#dom-imagedatasettings-pixelformat
mb.~alpha1:#dom-imagebitmaprenderingcontextsettings-alpha
mb.quality:#image-encode-options-quality
mb.type:#image-encode-options-type
mb.x:~GEOMETRY#dom-dompointinit-x
mb.y:~GEOMETRY#dom-dompointinit-x
IDL keywords
l.center:#dom-context-2d-textalign-center
l.end:#dom-context-2d-textalign-end
l.left:#dom-context-2d-textalign-left
l.right:#dom-context-2d-textalign-right
l.start:#dom-context-2d-textalign-start
l.alphabetic:#dom-context-2d-textbaseline-alphabetic
l.bottom:#dom-context-2d-textbaseline-bottom
l.hanging:#dom-context-2d-textbaseline-hanging
l.ideographic:#dom-context-2d-textbaseline-ideographic
l.middle:#dom-context-2d-textbaseline-middle
l.top:#dom-context-2d-textbaseline-top
l.srgb:#dom-predefinedcolorspace-srgb
l.srgb-linear:#dom-predefinedcolorspace-srgb-linear
l.display-p3:#dom-predefinedcolorspace-display-p3
l.display-p3-linear:#dom-predefinedcolorspace-display-p3-linear
l.unorm8:#dom-canvascolortype-unorm8
l.float16:#dom-canvascolortype-float16
l.evenodd:#dom-context-2d-fillrule-evenodd
l.nonzero:#dom-context-2d-fillrule-nonzero
l.high:#dom-context-2d-imagesmoothingquality-high
l.low:#dom-context-2d-imagesmoothingquality-low
l.medium:#dom-context-2d-imagesmoothingquality-medium
l.~inheritL:#dom-context-2d-lang-inherit
l.inherit:#dom-context-2d-direction-inherit
l.ltr:#dom-context-2d-direction-ltr
l.rtl:#dom-context-2d-direction-rtl
l.2d:#offscreen-context-type-2d
l.bitmaprenderer:#offscreen-context-type-bitmaprenderer
l.webgl:#offscreen-context-type-webgl
l.webgl2:#offscreen-context-type-webgl2
l.webgpu:#offscreen-context-type-webgpu
l.~autoK:#dom-context-2d-fontkerning-auto
l.~normalK:#dom-context-2d-fontkerning-normal
l.none:#dom-context-2d-fontkerning-none
l.ultra-condensed:#dom-context-2d-fontstretch-ultra-condensed
l.extra-condensed:#dom-context-2d-fontstretch-extra-condensed
l.condensed:#dom-context-2d-fontstretch-condensed
l.semi-condensed:#dom-context-2d-fontstretch-semi-condensed
l.~normalS:#dom-context-2d-fontstretch-normal
l.semi-expanded:#dom-context-2d-fontstretch-semi-expanded
l.expanded:#dom-context-2d-fontstretch-expanded
l.extra-expanded:#dom-context-2d-fontstretch-extra-expanded
l.ultra-expanded:#dom-context-2d-fontstretch-ultra-expanded
l.~normalC:#dom-context-2d-fontvariantcaps-normal
l.small-caps:#dom-context-2d-fontvariantcaps-small-caps
l.all-small-caps:#dom-context-2d-fontvariantcaps-all-small-caps
l.petite-caps:#dom-context-2d-fontvariantcaps-petite-caps
l.all-petite-caps:#dom-context-2d-fontvariantcaps-all-petite-caps
l.unicase:#dom-context-2d-fontvariantcaps-unicase
l.titling-caps:#dom-context-2d-fontvariantcaps-titling-caps
l.~autoR:#dom-context-2d-textrendering-auto
l.optimizeSpeed:#dom-context-2d-textrendering-optimizespeed
l.optimizeLegibility:#dom-context-2d-textrendering-optimizelegibility
l.geometricPrecision:#dom-context-2d-textrendering-geometricprecision
cC.2d:#canvas-context-2d
cC.bitmaprenderer:#canvas-context-bitmaprenderer
cC.webgl:#canvas-context-webgl
cC.webgl2:#canvas-context-webgl2
cC.webgpu:#canvas-context-webgpu
e.a:semantics.html#the-a-element
e.h1:semantics.html#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements
e.button:~HEforms#the-button-element
e.canvas:#the-canvas-element
e.img:~HEimages#the-img-element
e.input:~HEinput#the-input-element
e.select:~HEforms#the-select-element
e.textarea:~HEforms#the-textarea-element
e.video:~HEmedia#the-video-element
e.image:~SVGembedded#elementdef-image
e.use:~SVGstruct#elementdef-use
a.contenteditable:~HTMLinteraction#attr-contenteditable
a.height:#attr-canvas-height
a.multiple:~HEforms#attr-select-multiple
a.type:~HEinput#attr-input-type
a.usemap:~HEimages#attr-hyperlink-usemap
a.width:#attr-canvas-width
diM.height:~HEembed#attr-dim-height
diM.width:~HEembed#attr-dim-width
●用語
有限:#_finite
描法~状態~stack:#_drawing-state-stack
意図された~path:#intended-path
数量-値:#obtain-numeric-values
文脈~mode:#concept-canvas-context-mode
~canvas文脈~mode:#concept-canvas-context-mode
cM.bitmaprenderer:#concept-canvas-bitmaprenderer
cM.2d:#concept-canvas-2d
cM.webgl:#concept-canvas-webgl
cM.webgl2:#concept-canvas-webgl2
cM.webgpu:#concept-canvas-webgpu
cM.placeholder:#concept-canvas-placeholder
cM.none:#concept-canvas-none
oM.2d:#offscreencanvas-context-2d
oM.bitmaprenderer:#offscreencanvas-context-bitmaprenderer
oM.webgl:#offscreencanvas-context-webgl
oM.webgl2:#offscreencanvas-context-webgl2
oM.webgpu:#offscreencanvas-context-webgpu
oM.none:#offscreencanvas-context-none
oM.detached:#offscreencanvas-context-detached
mt.image/jpeg:~HTMLindex#image/jpeg
mt.image/png:~HTMLindex#image/png
mt.image/svg+xml:~HTMLindex#image/svg+xml
sl.display width:~WEBCODECS#dom-videoframe-display-width-slot
sl.display height:~WEBCODECS#dom-videoframe-display-height-slot
et.contextlost:~HTMLindex#event-contextlost
et.contextrestored:~HTMLindex#event-contextrestored
●CSS
p.border-radius:~CSSBORDER#propdef-border-radius
p.direction:~CSSWM#propdef-direction
p.font:~CSSFONT#propdef-font
p.font-size:~CSSFONT#propdef-font-size
p.font-width:~CSSFONT#propdef-font-width
p.font-stretch:~CSSFONT#propdef-font-stretch
p.font-weight:~CSSFONT#propdef-font-weight
p.font-variant-caps:~CSSFONT#propdef-font-variant-caps
p.font-kerning:~CSSFONT#propdef-font-kerning
p.letter-spacing:~CSSTEXT#letter-spacing-property
p.word-spacing:~CSSTEXT#propdef-word-spacing
p.white-space:~CSSTEXT#propdef-white-space
p.object-fit:~CSSIMAGE#propdef-object-fit
p.line-height:~CSS2J#propdef-line-height
p.text-rendering:~SVGpainting#TextRenderingProperty
at.font-face:~CSSFONT#at-font-face-rule
v.ultra-condensed:~CSSFONT#valdef-font-width-ultra-condensed
v.extra-condensed:~CSSFONT#valdef-font-width-extra-condensed
v.condensed:~CSSFONT#valdef-font-width-condensed
v.semi-condensed:~CSSFONT#valdef-font-width-semi-condensed
v.semi-expanded:~CSSFONT#valdef-font-width-semi-expanded
v.expanded:~CSSFONT#valdef-font-width-expanded
v.extra-expanded:~CSSFONT#valdef-font-width-extra-expanded
v.ultra-expanded:~CSSFONT#valdef-font-width-ultra-expanded
v.small-caps:~CSSFONT#valdef-font-variant-caps-small-caps
v.all-small-caps:~CSSFONT#valdef-font-variant-caps-all-small-caps
v.petite-caps:~CSSFONT#valdef-font-variant-caps-petite-caps
v.all-petite-caps:~CSSFONT#valdef-font-variant-caps-all-petite-caps
v.unicase:~CSSFONT#valdef-font-variant-caps-unicase
v.titling-caps:~CSSFONT#valdef-font-variant-caps-titling-caps
v.srgb:~CSSCOLOR#valdef-color-srgb
v.srgb-linear:~CSSCOLOR#valdef-color-srgb-linear
v.display-p3:~CSSCOLOR#valdef-color-display-p3
v.display-p3-linear:~CSSCOLOR#display-p3-linear-space
v.relative-colorimetric:~CSSCOLOR5#valdef-color-profile-rendering-intent-relative-colorimetric
v.conic-gradient():~CSSIMAGE4#funcdef-conic-gradient
v.source-over:~COMPOSITING#source-over
~COMPOSITING#porterduffcompositingoperators_srcover
v.copy:~COMPOSITING#copy
~COMPOSITING#porterduffcompositingoperators_src
st.Checkbox:~HEinput#checkbox-state-(type=checkbox)
st.Radio:~HEinput#radio-button-state-(type=radio)
t.length:~CSSVAL#length-value
t.length:~CSSVAL#lengths
t.color:~CSSCOLOR#typedef-color
t.filter-value-list:~FILTERS#typedef-filter-value-list
t.blend-mode:~COMPOSITING#ltblendmodegt
t.composite-mode:~COMPOSITING#compositemode
●js
jt.Number:~TC39#sec-ecmascript-language-types-number-type
jA.IsDetachedBuffer:~TC39#sec-isdetachedbuffer
sl.Detached:~HTMLcloning#detached
●用語
~2D描画~文脈:#_2d-rendering-context
~2D文脈を作成する:#2d-context-creation-algorithm
~offscreen~canvas用の~2D文脈:#offscreencanvasrenderingcontext2d
~offscreen~2D文脈を作成する:#offscreen-2d-context-creation-algorithm
~ImageBitmapRenderingContextを作成する:#imagebitmaprenderingcontext-creation-algorithm
画像~dataの画素を~bitmap上に置く:#dom-context2d-putimagedata-common
文脈~喪失dか:#concept-canvas-context-lost
~fill手続き:#fill-steps
~stroke手続き:#stroke-steps
~clip手続き:#clip-steps
点は~path内か？手続き:#is-point-in-path-steps
点は~stroke内か？手続き:#is-point-in-stroke-steps
楕円~上の点を決定する手続き:#determine-the-point-on-an-ellipse-steps
ofC.継承した言語:#offscreencanvas-inherited-lang
ofC.継承した方向:#offscreencanvas-inherited-direction
ofC.文脈~mode:#offscreencanvas-context-mode
ofC.~bitmap:#offscreencanvas-bitmap
画像~引数は利用-可能か検査する:#check-the-usability-of-the-image-argument
生成元cleanか:#concept-canvas-origin-clean
~placeholder~canvas要素:#offscreencanvas-placeholder
~canvas設定群の出力~bitmapを初期化する:#canvas-setting-init-bitmap
~ImageBitmapRenderingContextの出力~bitmapを設定する:#set-an-imagebitmaprenderingcontext's-output-bitmap
~bitmap寸法を設定する:#concept-canvas-set-bitmap-dimensions
~bitmapを~fileとして直列化する:#a-serialisation-of-the-bitmap-as-a-file
iBM.~alpha~flag:#concept-imagebitmaprenderingcontext-alpha
iBM.~bitmap~mode:#concept-imagebitmaprenderingcontext-bitmap-mode
iBM.~blank:#concept-imagebitmaprenderingcontext-blank
iBM.出力~bitmap:#concept-imagebitmaprenderingcontext-output-bitmap
~OffscreenCanvas~obj:#associated-offscreencanvas-object
o2D.~OffscreenCanvas~obj:#associated-offscreencanvas-object
結付けられた~OffscreenCanvas~obj:#associated-offscreencanvas-object
~textを準備する:#text-preparation-algorithm
~text準備~algo:#text-preparation-algorithm
引数は生成元cleanでない:#the-image-argument-is-not-origin-clean
~UI:#canvasuserinterface
iBM.妥当:#concept-imagebitmaprenderingcontext-valid
~canvas~blob直列化~task~source:#canvas-blob-serialisation-task-source
関連な~canvas~fallback内容として利用-中にある:#being-used-as-relevant-canvas-fallback-content
~ellipse~method手続き:#ellipse-method-steps
利用者に伝える:#inform
~path:#concept-path
線~区分:#line-segments
新たな下位pathは必要か:#need-new-subpath
下位pathありを確保する:#ensure-there-is-a-subpath
~pathをナゾる:#trace-a-path
§画素~操作:#pixel-manipulation
:#drawCustomFocusRingExample
~alphaにより乗算済み:#concept-premultiplied-alpha
乗算済み色~値を非-乗算済み表現へ変換する:#convert-from-premultiplied
非-乗算済み色~値を乗算済み表現へ変換する:#convert-to-premultiplied
●用語（描法
2D.色~空間:#concept-canvas-color-space
2D.色~型:#concept-canvas-color-type
2D.非同期化されるか:#concept-canvas-desynchronized
2D.高頻度に読取ることになるか:#concept-canvas-will-read-frequently
読戻n用に最適化する:#concept-canvas-will-read-frequently
2D.出力~bitmap:#output-bitmap
2D.~alpha:#concept-canvas-alpha
2D.~fill~style:#concept-canvasfillstrokestyles-fill-style
2D.~stroke~style:#concept-canvasfillstrokestyles-stroke-style
2D.字l間のアキ:#concept-canvastextdrawingstyles-letter-spacing
2D.単語~間のアキ:#concept-canvastextdrawingstyles-word-spacing
2D.~filter:#concept-canvas-current-filter
2D.現在の組成~混色~演算子:#current-compositing-and-blending-operator
2D.大域~alpha:#concept-canvas-global-alpha
2D.現在の~filter:#concept-canvas-current-filter
2D.影~色:#concept-canvasshadowstyles-shadow-color
2D.言語:#concept-canvastextdrawingstyles-language
2D.方向:#_concept-canvastextdrawingstyles-direction
~nonzero巻数~規則:#dom-context-2d-fillrule-nonzero
影~属性:#shadows
影~効果:#shadows
切抜き領域:#clipping-region
影を描く:#when-shadows-are-drawn
影を描いた:#when-shadows-are-drawn
現在の既定の~path:#current-default-path
現在の変形n行列:#current-transformation-matrix
＊現在の変形n行列:#transformations
~dash~list:#dash-list
描法~model:#drawing-model
描法~状態:#drawing-state
~fill規則:#fill-rule
変形n行列:#transformations
~font~style~source:#font-style-source-object
paT.生成元cleanか:#concept-canvas-pattern-not-origin-clean
生成元cleanでない:#concept-canvas-pattern-not-origin-clean
paT.繰返しの挙動:#_canvas-pattern-repetition
paT.画像:#_canvas-pattern-image
paT.変形n行列:#_canvas-pattern-transformation-matrix
描画~文脈を既定の状態に設定し直す:#reset-the-rendering-context-to-its-default-state
補間と外挿:#interpolation
必要なら~focusを描く:#draw-focus-if-needed
●用語（HTML
並列的:~HTMLINFRA#in-parallel
反映する:~HTMLcdom#reflect
負でない整数として構文解析-:~HTMLcms#rules-for-parsing-non-negative-integers
妥当な負でない整数:~HTMLcms#valid-non-negative-integer
転送-可能:~HTMLcloning#transferable-objects
転送-手続き:~HTMLcloning#transfer-steps
転送-受信-時の手続き:~HTMLcloning#transfer-receiving-steps
~CORS非同一-生成元:~HTMLurl#cors-cross-origin
分類:~HTMLdom#concept-element-categories
内容~属性:~HTMLdom#concept-element-attributes
内容~model:~HTMLdom#concept-element-content-model
この要素を利用できる文脈:~HTMLdom#concept-element-contexts
~accessibilityの考慮点:~HTMLdom#concept-element-accessibility-considerations
~DOM~interface:~HTMLdom#concept-element-dom
~flow内容:~HTMLdom#flow-content-2
大域~属性:~HTMLdom#global-attributes
可触~内容:~HTMLdom#palpable-content-2
句ng内容:~HTMLdom#phrasing-content-2
text/html における~tag省略:~HTMLdom#concept-element-tag-omission
透過的:~HTMLdom#transparent
埋込d内容:~HTMLdom#embedded-content-category
~fallback内容:~HTMLdom#fallback-content
ヤリトリありな内容:~HTMLdom#interactive-content-2
表現-:~HTMLdom#represents
言語:~HTMLdom#language
方向性:~HTMLdom#the-directionality
i.明示的に未知:~HTMLdom#concept-explicitly-unknown
i.~ltr:~HTMLdom#concept-ltr
i.~rtl:~HTMLdom#concept-rtl
具現化されて:~HTMLrendering#being-rendered
~bitmap~data:~HTMLGAPI#concept-imagebitmap-bitmap-data
画像~dataを初期化する:~HTMLGAPI#initialize-an-imagedata-object
~button:~HEforms#concept-button
表示~size:~HEforms#concept-select-size
~focus可能な区画:~HTMLinteraction#focusable-area
~focus可能:~HTMLinteraction#focusable
~focusされて:~HTMLinteraction#focused
壊れている:~HEimages#img-error
現在の要請:~HEimages#current-request
imG.状態:~HEimages#img-req-state
画像~data:~HEimages#img-req-data
現在の再生~位置:~HEmedia#current-playback-position
全部的に復号-可能:~HEimages#img-good
vD.生来な縦幅:~HEmedia#concept-video-intrinsic-height
vD.生来な横幅:~HEmedia#concept-video-intrinsic-width
~media資源:~HEmedia#media-resource
~media~data:~HEmedia#media-data
結付けられた文書:~WINDOW#concept-document-window
関連な大域~obj:~WAPI#concept-relevant-global
~event~loop:~WAPI#event-loop
~window~event~loop:~WAPI#window-event-loop
~worker~event~loop:~WAPI#worker-event-loop-2
関連な~agent:~WAPI#relevant-agent
aG.~event~loop:~WAPI#concept-agent-event-loop
大域~taskを~queueする:~WAPI#queue-a-global-task
要素~taskを~queueする:~WAPI#queue-an-element-task
~DOM操作~task~source:~WAPI#dom-manipulation-task-source
関連な~realm:~WAPI#concept-relevant-realm
関連な設定群~obj:~WAPI#relevant-settings-object
担当の~event~loop:~WAPI#responsible-event-loop
~scriptingは不能化されて:~WAPI#concept-n-noscript
~scriptingは可能化されて:~WAPI#concept-n-script
描画を更新する:~WAPI#update-the-rendering
~event~handler:~WAPI#event-handlers
~event~handler~event型:~WAPI#event-handler-event-type
~event~handler~IDL属性:~WAPI#event-handler-idl-attributes
文脈~喪失d時の手続き:~WAPI#context-lost-steps
閲覧~文脈:~HTMLds#browsing-context
生成元:~ORIGIN#concept-origin
同一-生成元:~ORIGIN#same-origin
~worker:~WORKERS#workers
●用語（外部
~ASCII小文字~化:~INFRA#ascii-lowercase
~ASCII空白:~INFRA#ascii-whitespace
一致する:~INFRA#string-is
~size:~INFRA#list-size
付加する:~INFRA#list-append
~MIME型:~MIMESNIFF#mime-type
行列を~2D辞書で初期化する:~GEOMETRY#_initialize-matrix-with-dictionary-2d
行列を~2D行列に初期化する:~GEOMETRY#_initialize-matrix-2d
~2D行列:#_2d-matrix
右から乗算する:~GEOMETRY#post-multiply
左から乗算する:~GEOMETRY#pre-multiply
~data-URL:~RFCx/rfc2397#section-2
文書~要素:~DOM4#document-element
~shadow~tree:~DOM4#concept-shadow-tree
新たな~obj:~WEBIDLjs#new
新たな~promise:~WEBIDLjs#a-new-promise
却下される~promise:~WEBIDLjs#a-promise-rejected-with
~promiseを却下する:~WEBIDLjs#reject
~promiseを解決する:~WEBIDLjs#resolve
~IDL値に変換する:~WEBIDLjs#dfn-convert-javascript-to-idl-value
~JS値に変換する:~WEBIDLjs#dfn-convert-idl-to-javascript-value
~IDL値に変換する:~WEBIDLjs#js-type-mapping
~JS値に変換する:~WEBIDLjs#js-type-mapping
~callback関数を呼出す:~WEBIDLjs#invoke-a-callback-function
算出d値:~CASCADE#computed-value
~fontに相対的な長さ:~CSSVAL#font-relative-length
css.px:~CSSVAL#px
css.em:~CSSVAL#em
css.ex:~CSSVAL#ex
~CSS~pixel:~CSSVAL#px
~CSS全域~keyword:~CSSVAL#common-keywords