@media (prefers-color-scheme: light){:root{--color-foreground: #333333;--color-background: #ffffff;--color-light-grey: #ccc;--color-grey: #666666;--color-white: #fff;--color-link: #3b5998;--color-subsection-link: var(--color-foreground);--color-toc-link: var(--color-foreground);--color-toc-id: var(--color-link);--color-toggle-border: #bbc;--color-sidebar-background: #f0f0f0;--color-sidebar-viewing-link: #8b9;--color-sidebar-toggle-button: rgba(0, 0, 0, .7);--color-sidebar-shadow-inset: rgba(0, 0, 0, .05);--color-sidebar-shadow: rgba(0, 0, 0, .04);--color-sidebar-large-shadow: rgba(0, 0, 0, .08);--color-pre-background: #fafafa;--color-pre-border: #e9e9e9;--color-code-background: rgba(0, 0, 0, .03);--color-spec-todo: var(--color-grey);--color-spec-example: #fafaff;--color-spec-example-border: #bbbbff;--color-spec-counter-example: #fffafa;--color-spec-counter-border: #ffbbbb;--color-spec-counter-example-link: #98593b;--color-spec-added-border: #396;--color-spec-removed-border: #933;--color-spec-prose: var(--color-grey);--color-spec-quantifier-list: var(--color-link);--color-spec-quantifier-optional: #83238e;--color-spec-condition: #1c7758;--color-spec-param: var(--color-grey);--color-spec-rx: var(--color-foreground);--color-spec-note-border: #f4e925;--color-spec-note-background: #fefef3;--color-spec-note-first-link: #6c6613;--color-source-link: var(--color-light-grey);--color-table-header: #f9f9f9;--color-table-header-border: #d0d0d0;--color-token-inserted: hsla(241, 71%, 34%, .69);--color-token-deleted: hsla(324, 92%, 33%, .74);--color-inserts-background: rgba(0, 200, 30, .08);--color-deletions-background: rgba(200, 0, 0, .08);--selection-background-color: #cacee0;--selection-background-color-link: #f0babe}.selection-link:hover{--selection-background-color: #3b5998}}@media (prefers-color-scheme: dark){:root{--color-foreground: #b6b6b6;--color-background: #262626;--color-light-grey: #373737;--color-grey: #828282;--color-white: rgb(29, 29, 29);--color-link: #89b7da;--color-subsection-link: var(--color-foreground);--color-toc-link: var(--color-foreground);--color-toc-id: var(--color-link);--color-toggle-border: #bbc;--color-sidebar-background: #323232;--color-sidebar-viewing-link: #8b9;--color-sidebar-toggle-button: rgba(220, 220, 220, .7);--color-sidebar-shadow-inset: rgba(0, 0, 0, .05);--color-sidebar-shadow: rgba(0, 0, 0, .04);--color-sidebar-large-shadow: rgba(0, 0, 0, .08);--color-pre-background: #2e2e2e;--color-pre-border: #3a3a3a;--color-code-background: rgba(41, 41, 41, .03);--color-spec-todo: var(--color-grey);--color-spec-example: #2b2b35;--color-spec-example-border: #4d4d6d;--color-spec-counter-example: #322828;--color-spec-counter-border: #664040;--color-spec-counter-example-link: #ff702d;--color-spec-added-border: #396;--color-spec-removed-border: #933;--color-spec-prose: var(--color-grey);--color-spec-quantifier-list: var(--color-link);--color-spec-quantifier-optional: #c689ce;--color-spec-condition: #6fa889;--color-spec-param: var(--color-grey);--color-spec-rx: var(--color-foreground);--color-spec-note-border: #605e39;--color-spec-note-background: #303028;--color-spec-note-first-link: #f0e330;--color-source-link: var(--color-grey);--color-table-header: #373737;--color-table-header-border: #525252;--color-token-inserted: hsla(241, 63%, 70%, .69);--color-token-deleted: hsla(325, 64%, 67%, .74);--color-inserts-background: rgba(0, 200, 30, .08);--color-deletions-background: rgba(200, 0, 0, .08);--selection-background-color: #656565;--selection-background-color-link: #f0babe}.selection-link:hover{--selection-background-color: #829edb}}:root{color:var(--color-foreground);background-color:var(--color-background);font-family:var(--font-family);font-size:15px;line-height:1.5;--mono-font-size: 13px;--indent: 1rem;--list-indent: 1.5rem;--dfn-indent: 0rem;--font-family: Cambria, "Palatino Linotype", Palatino, "Liberation Serif", serif;--font-family-monospace: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace}@media (min-width: 720px){:root{font-size:17px;--mono-font-size: 15px;--indent: 2rem;--list-indent: 2rem;--dfn-indent: 2rem}}body{margin:3rem 0 3rem}article{margin:0 1rem}@media (min-width: 720px){body{margin:6rem auto 3rem;max-width:800px;padding-left:75px;padding-right:clamp(0px,calc((100vw - 800px) * .25),75px)}}.source-link{display:none}@media screen and (min-width: 720px){.source-link{display:block;position:absolute;width:18px;fill:var(--color-source-link);opacity:.3}.source-link:hover{opacity:1}}.outdated-selection-link,.selection-link{position:absolute;display:block;color:var(--color-white);background:var(--selection-background-color);border-radius:4px;font-size:36px;height:23px;line-height:48px;text-align:center;text-decoration:none;width:25px;user-select:none;-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none}.outdated-selection-link:hover,.selection-link:hover{text-decoration:none}.outdated-selection-link:before,.selection-link:before{border:5px solid transparent;content:"";height:0;margin-top:-5px;margin-right:-5px;position:absolute;right:1px;top:50%;width:0}@media (max-width: 719px){.outdated-selection-link:before,.selection-link:before{border-bottom-color:var(--selection-background-color);border-top:0;right:50%;top:1px}}@media (min-width: 720px){.outdated-selection-link:before,.selection-link:before{border-left-color:var(--selection-background-color);border-right:0;right:1px;top:50%}}.outdated-selection-link{background:var(--selection-background-color-link);font-size:21px;font-weight:800;line-height:27px}.outdated-selection-link:hover:after{content:"This selection content has changed since this link was created.";font:9pt/11pt var(--font-family);position:absolute;display:block;white-space:nowrap;padding:2px 5px 1px;top:-20px;background:black;color:var(--color-white)}a{color:var(--color-link);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}dl{margin:1rem 0 1rem var(--dfn-indent)}dd{margin:.25em 0 .5em var(--indent)}dd+dd{margin-top:1rem}dfn,.spec-ref{font-style:italic}dfn>a,.spec-ref>a{color:inherit}h1,h2,h3,h4,h5,h6{font-weight:bold;margin:3em 0 1em;position:relative}@media (min-width: 720px){header>h1{margin:6em 0 3em}}h1{font-size:1.5em;margin-top:5em}h2,h3{font-size:1.25em}h4,h5,h6{font-size:1em}section{padding-top:1rem;margin-top:-1rem}section.subsec>h6{margin-top:2em}section.subsec>h6>a{color:var(--color-subsection-link)}section .spec-secid{margin-right:1ex}@media (min-width: 720px){section .spec-secid{position:absolute;right:100%;text-align:right;white-space:nowrap}}footer{font-size:75%;opacity:.5;text-align:center;margin-top:12rem}.spec-toc{margin:1rem 0 3rem}.spec-toc .title{content:"Contents";display:block;font-weight:bold;margin:5em 0 1em}.spec-toc .spec-secid{margin-right:1ex}.spec-toc ol{list-style:none;padding-left:0;margin-top:0;margin-bottom:0}.spec-toc ol ol{list-style:none;padding-left:2ex;margin-bottom:.25em}.spec-toc li{position:relative;padding:5px 0 0 30px;margin:-5px 0 0 -30px}.spec-toc a{color:var(--color-toc-link)}.spec-toc a:hover{text-decoration:none}.spec-toc a .spec-secid{color:var(--color-toc-id)}.spec-toc a:hover .spec-secid{text-decoration:underline}.spec-toc .toggle{display:none}.spec-toc .toggle+label{cursor:pointer;left:6px;opacity:1;padding:5px 6px 5px 7px;position:absolute;top:6px;transform:rotate(0deg);transition:all .18s ease-in-out}.spec-toc .toggle+label:after{border-color:transparent transparent transparent var(--color-toggle-border);border-style:solid;border-width:6px 0 6px 7px;content:" ";display:block;height:0;width:0}@media (pointer: fine){.spec-toc .toggle+label{left:10px;padding:3px 5px 3px 6px;top:8px}}.spec-toc .toggle:checked+label{transform:rotate(90deg)}@media (hover: hover){.spec-toc li:not(:hover)>.toggle:checked+label{opacity:0}}.spec-toc .toggle:not(:checked)~ol{max-height:0;overflow:hidden;margin:0}.spec-sidebar-toggle{display:none}.spec-sidebar-toggle+label>.spec-sidebar-button{position:fixed;right:0;top:0;padding:10px 15px;font-size:30px;color:var(--color-sidebar-toggle-button);z-index:2;cursor:pointer;user-select:none;-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none}.spec-sidebar-toggle:checked+label:after{content:"";position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:0}.spec-sidebar{display:none;position:fixed;right:0;top:0;width:min(320px,calc(100vw - 48px));font-size:14px;line-height:1.75;overflow-y:scroll;height:100%;padding:0 0 5rem 30px;box-sizing:border-box;background:var(--color-sidebar-background);box-shadow:inset 1px 0 var(--color-sidebar-shadow-inset),-4px 0 8px -2px var(--color-sidebar-shadow);overscroll-behavior:contain}.spec-sidebar{user-select:none;-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none}.spec-sidebar-toggle:checked~.spec-sidebar{display:block}.spec-sidebar .viewing>a:after{color:var(--color-sidebar-viewing-link);content:"\2022";margin-left:1ex}@media (min-width: 1220px){.spec-sidebar-toggle+label{display:none}.spec-sidebar{display:block;box-shadow:inset 1px 0 var(--color-sidebar-shadow-inset),inset 4px 0 8px -2px var(--color-sidebar-large-shadow)!important}body{padding-right:345px}}.spec-note{background:var(--color-spec-note-background);border-left:solid 4px var(--color-spec-note-border);margin:1rem -1rem;min-width:70vw;padding:8px 1rem 12px calc(1rem - 4px);width:-moz-fit-content;width:-webkit-fit-content;width:fit-content}@media (min-width: 720px){.spec-note{min-width:416px}}.spec-note>a:first-child{color:var(--color-spec-note-first-link);display:block;font:italic 11pt/18pt var(--font-family);opacity:.6;user-select:none}.spec-todo{color:var(--color-spec-todo);margin:1em 0 1em 5em;min-height:1em}.spec-todo::before{content:"todo";display:block;float:left;margin-left:-5em;text-transform:uppercase}.spec-index ol{list-style-type:none;margin:0 0 0 var(--indent);padding:0;column-width:210px;column-gap:var(--indent)}.spec-index ol li{width:min-content;white-space:nowrap}pre,code{font-family:var(--font-family-monospace);font-size:var(--mono-font-size);font-weight:inherit}code{background:var(--color-code-background);margin:-2px -1px;padding:3px 3px;white-space:pre-wrap}pre>code{background:none;font-weight:inherit;margin:0;padding:0;white-space:pre}pre{background:var(--color-pre-background);border-left:solid 4px var(--color-pre-border);margin:1rem -1rem;min-width:70vw;padding:12px 1rem 12px calc(1rem - 4px);width:-moz-fit-content;width:-webkit-fit-content;width:fit-content;max-width:calc(100vw - 2rem);overflow-y:auto}@media (min-width: 720px){pre{min-width:40ch}}.spec-example{background:var(--color-spec-example);border-left:solid 4px var(--color-spec-example-border);padding-top:8px}.spec-counter-example{background:var(--color-spec-counter-example);border-left:solid 4px var(--color-spec-counter-border);padding-top:8px}.spec-example>a,.spec-counter-example>a{display:block;font:italic 11pt/18pt var(--font-family);opacity:.6;user-select:none}.spec-counter-example>a{color:var(--color-spec-counter-example-link)}table{border-collapse:collapse}th{background-color:var(--color-table-header)}td,th{border:1px solid var(--color-table-header-border);padding:.4em;vertical-align:baseline}ol,ul{padding-left:var(--list-indent)}li>ol,li>ul{margin-top:.25em;margin-bottom:.5em}li+li{margin-top:.25em}li.task{list-style-type:none;position:relative}li.task>input:first-child{margin-left:0;position:absolute;transform:translateX(calc(-100% - 1ch))}ins{background-color:var(--color-inserts-background);text-decoration:none}del{background-color:var(--color-deletions-background)}.spec-added,.spec-removed{border-left:4px solid;margin-left:-18px;padding-left:14px}.spec-added{border-color:var(--color-spec-added-border)}.spec-removed{border-color:var(--color-spec-removed-border);text-decoration:line-through}.spec-keyword{font-weight:bold}.spec-string{font-family:var(--font-family-monospace);font-size:85%;white-space:pre}var{font-style:italic}*[data-name]{transition:.15s background ease-out;border-radius:2px;padding:0 3px;margin:0 -3px}.spec-semantic,.spec-algo{margin:1rem 0 1rem var(--dfn-indent)}.spec-semantic>.spec-nt::after,.spec-algo>.spec-call:first-child::after{content:":";font-style:normal;font-weight:bold;margin-left:1ex}.spec-semantic ol,.spec-semantic ol ol ol ol,.spec-algo ol,.spec-algo ol ol ol ol{list-style-type:decimal}.spec-semantic ol ol,.spec-semantic ol ol ol ol ol,.spec-algo ol ol,.spec-algo ol ol ol ol ol{list-style-type:lower-alpha}.spec-semantic ol ol ol,.spec-semantic ol ol ol ol ol ol,.spec-algo ol ol ol,.spec-algo ol ol ol ol ol ol{list-style-type:lower-roman}.spec-call>a{color:inherit}.spec-production{margin:1rem 0 1rem var(--dfn-indent)}.spec-production>.spec-nt::after{content:":";font-style:normal;font-weight:bold;margin:0 1ex}.spec-semantic.d2>.spec-nt::after,.spec-production.d2>.spec-nt::after{content:"::"}.spec-semantic.d3>.spec-nt::after,.spec-production.d3>.spec-nt::after{content:":::"}.spec-production>.spec-rhs{line-height:1.1;margin:.25em 0 .5em calc(2 * var(--indent));text-indent:calc(-1 * var(--indent))}.spec-semantic>.spec-rhs{display:inline-block;text-indent:calc(-1 * var(--indent));margin-left:calc(1ex + var(--indent))}.spec-rhs>*{text-indent:0}.spec-oneof{display:inline}.spec-oneof::before{content:"one of";font-style:normal;font-weight:bold}.spec-oneof-grid{max-width:calc(100vw - 2rem);overflow:auto;margin:-1ex -1rem;padding:1ex 1rem}.spec-oneof-grid>table{margin-left:var(--indent)}.spec-oneof .spec-rhs{border:none;margin:0;padding:0 0 0 1rem;vertical-align:baseline;white-space:pre}.spec-oneof .spec-rhs:first-child{padding:0}.spec-rhs .spec-constrained:not(:first-child),.spec-rhs .spec-quantified:not(:first-child),.spec-rhs .spec-nt:not(:first-child),.spec-rhs .spec-t:not(:first-child),.spec-rhs .spec-rx:not(:first-child),.spec-rhs .spec-prose:not(:first-child),.spec-rhs .spec-empty:not(:first-child),.spec-rhs .spec-lookahead:not(:first-child){margin-left:1ex;display:inline-block}.spec-condition{font-size:85%}.spec-condition::before{content:"[if "}.spec-condition.not::before{content:"[if not "}.spec-condition::after{content:"]"}.spec-empty,.spec-prose{color:var(--color-spec-prose)}.spec-nt{font-style:italic}.spec-nt>a{color:inherit}.spec-quantifiers,.spec-params{font-size:65%;font-style:normal;vertical-align:sub}.spec-quantifier.list{color:var(--color-spec-quantifier-list)}.spec-quantifier.optional{color:var(--color-spec-quantifier-optional)}.spec-params,.spec-condition{color:var(--color-spec-condition)}.spec-params::before{content:"["}.spec-params::after{content:"]"}.spec-quantifier:not(:last-child)::after,.spec-param:not(:last-child)::after{color:var(--color-spec-param);content:", "}.spec-param.conditional::before{content:"?"}.spec-param.negated::before{content:"!"}.spec-t,.spec-rx{color:var(--color-spec-rx);font-family:var(--font-family-monospace);font-weight:bold}.spec-butnot::before{color:var(--color-grey);content:"but not";font-family:var(--font-family);font-weight:normal;margin-right:1ex}.spec-butnot>*:not(:first-child)::before{color:var(--color-grey);content:"or";font-family:var(--font-family);font-weight:normal;margin-right:1ex}.spec-rhs .spec-oneof::before,.spec-rhs .spec-butnot::before{margin-left:1ex}.spec-lookahead>*{margin:0!important}.spec-lookahead>*:not(:first-child)::before{color:var(--color-grey);content:", ";font-family:var(--font-family);font-style:normal;font-weight:normal}.spec-lookahead::before{color:var(--color-grey);content:"[lookahead = ";font-family:var(--font-family);font-style:normal;font-weight:normal}.spec-lookahead.not::before{content:"[lookahead \2260  "}.spec-lookahead.set::before{content:"[lookahead \2208  {";margin-right:0}.spec-lookahead.set.not::before{content:"[lookahead \2209  {"}.spec-lookahead.ntset::before{content:"[lookahead \2208  ";margin-right:0}.spec-lookahead.ntset.not::before{content:"[lookahead \2209  "}.spec-lookahead::after{color:var(--color-grey);content:"]"}.spec-lookahead.set::after{content:"}]"}code[class*=language-],pre[class*=language-]{color:var(--color-prism-foreground);background:none;text-shadow:0 1px var(--color-prism-text-shadow);font-family:var(--font-family-monospace);font-size:1em;text-align:left;white-space:pre;word-spacing:normal;word-break:normal;word-wrap:normal;line-height:1.5;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-hyphens:none;-moz-hyphens:none;-ms-hyphens:none;hyphens:none}pre[class*=language-]::-moz-selection,pre[class*=language-] ::-moz-selection,code[class*=language-]::-moz-selection,code[class*=language-] ::-moz-selection{text-shadow:none;background:var(--color-prism-background)}pre[class*=language-]::selection,pre[class*=language-] ::selection,code[class*=language-]::selection,code[class*=language-] ::selection{text-shadow:none;background:var(--color-prism-background)}@media print{code[class*=language-],pre[class*=language-]{text-shadow:none}}pre[class*=language-]{padding:1em;margin:.5em 0;overflow:auto}:not(pre)>code[class*=language-],pre[class*=language-]{background:var(--color-prism-block-background)}:not(pre)>code[class*=language-]{padding:.1em;border-radius:.3em;white-space:normal}.token.atrule,.token.attr-value,.token.keyword,.token.property,.token.selector,.token.attr-name,.token.builtin,.token.entity,.token.url,.token.inserted{color:var(--color-token-inserted);background:none}.token.tag,.token.boolean,.token.number,.token.string,.token.char,.token.constant,.token.symbol,.token.regex,.token.important,.token.variable,.token.function,.token.class-name,.token.deleted{color:var(--color-token-deleted)}.token.comment,.token.prolog,.token.doctype,.token.cdata,.token.description{color:inherit;opacity:.3}.token.punctuation{color:inherit;opacity:.5}.token.operator,.token.namespace{color:inherit;opacity:.7}