trusted-types
Version:
Polyfill for the Trusted Types
1,584 lines (1,410 loc) • 418 kB
HTML
<!doctype html><html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
<title>Trusted Types</title>
<style data-fill-with="stylesheet">/******************************************************************************
* Style sheet for the W3C specifications *
*
* Special classes handled by this style sheet include:
*
* Indices
* - .toc for the Table of Contents (<ol class="toc">)
* + <span class="secno"> for the section numbers
* - #toc for the Table of Contents (<nav id="toc">)
* - ul.index for Indices (<a href="#ref">term</a><span>, in §N.M</span>)
* - table.index for Index Tables (e.g. for properties or elements)
*
* Structural Markup
* - table.data for general data tables
* -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
* -> use <table class='complex data'> for extra-complex tables
* -> use <td class='long'> for paragraph-length cell content
* -> use <td class='pre'> when manual line breaks/indentation would help readability
* - dl.switch for switch statements
* - ol.algorithm for algorithms (helps to visualize nesting)
* - .figure and .caption (HTML4) and figure and figcaption (HTML5)
* -> .sidefigure for right-floated figures
* - ins/del
*
* Code
* - pre and code
*
* Special Sections
* - .note for informative notes (div, p, span, aside, details)
* - .example for informative examples (div, p, pre, span)
* - .issue for issues (div, p, span)
* - .assertion for assertions (div, p, span)
* - .advisement for loud normative statements (div, p, strong)
* - .annoying-warning for spec obsoletion notices (div, aside, details)
*
* Definition Boxes
* - pre.def for WebIDL definitions
* - table.def for tables that define other entities (e.g. CSS properties)
* - dl.def for definition lists that define other entitles (e.g. HTML elements)
*
* Numbering
* - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
* - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
* - ::before styled for CSS-generated issue/example/figure numbers:
* -> Documents wishing to use this only need to add
* figcaption::before,
* .caption::before { content: "Figure " counter(figure) " "; }
* .example::before { content: "Example " counter(example) " "; }
* .issue::before { content: "Issue " counter(issue) " "; }
*
* Header Stuff (ignore, just don't conflict with these classes)
* - .head for the header
* - .copyright for the copyright
*
* Miscellaneous
* - .overlarge for things that should be as wide as possible, even if
* that overflows the body text area. This can be used on an item or
* on its container, depending on the effect desired.
* Note that this styling basically doesn't help at all when printing,
* since A4 paper isn't much wider than the max-width here.
* It's better to design things to fit into a narrower measure if possible.
* - js-added ToC jump links (see fixup.js)
*
******************************************************************************/
/******************************************************************************/
/* Body */
/******************************************************************************/
body {
counter-reset: example figure issue;
/* Layout */
max-width: 50em; /* limit line length to 50em for readability */
margin: 0 auto; /* center text within page */
padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag */
/* Typography */
line-height: 1.5;
font-family: sans-serif;
widows: 2;
orphans: 2;
word-wrap: break-word;
overflow-wrap: break-word;
hyphens: auto;
/* Colors */
color: black;
background: white top left fixed no-repeat;
background-size: 25px auto;
}
/******************************************************************************/
/* Front Matter & Navigation */
/******************************************************************************/
/** Header ********************************************************************/
div.head { margin-bottom: 1em }
div.head hr { border-style: solid; }
div.head h1 {
font-weight: bold;
margin: 0 0 .1em;
font-size: 220%;
}
div.head h2 { margin-bottom: 1.5em;}
/** W3C Logo ******************************************************************/
.head .logo {
float: right;
margin: 0.4rem 0 0.2rem .4rem;
}
.head img[src*="logos/W3C"] {
display: block;
border: solid #1a5e9a;
border-width: .65rem .7rem .6rem;
border-radius: .4rem;
background: #1a5e9a;
color: white;
font-weight: bold;
}
.head a:hover > img[src*="logos/W3C"],
.head a:focus > img[src*="logos/W3C"] {
opacity: .8;
}
.head a:active > img[src*="logos/W3C"] {
background: #c00;
border-color: #c00;
}
/* see also additional rules in Link Styling section */
/** Copyright *****************************************************************/
p.copyright,
p.copyright small { font-size: small }
/** Back to Top / ToC Toggle **************************************************/
@media print {
#toc-nav {
display: none;
}
}
@media not print {
#toc-nav {
position: fixed;
z-index: 2;
bottom: 0; left: 0;
margin: 0;
min-width: 1.33em;
border-top-right-radius: 2rem;
box-shadow: 0 0 2px;
font-size: 1.5em;
color: black;
}
#toc-nav > a {
display: block;
white-space: nowrap;
height: 1.33em;
padding: .1em 0.3em;
margin: 0;
background: white;
box-shadow: 0 0 2px;
border: none;
border-top-right-radius: 1.33em;
background: white;
}
#toc-nav > #toc-jump {
padding-bottom: 2em;
margin-bottom: -1.9em;
}
#toc-nav > a:hover,
#toc-nav > a:focus {
background: #f8f8f8;
}
#toc-nav > a:not(:hover):not(:focus) {
color: #707070;
}
/* statusbar gets in the way on keyboard focus; remove once browsers fix */
#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
padding-bottom: 1.5rem;
}
#toc-nav:not(:hover) > a:not(:focus) > span + span {
/* Ideally this uses :focus-within on #toc-nav */
display: none;
}
#toc-nav > a > span + span {
padding-right: 0.2em;
}
#toc-toggle-inline {
vertical-align: 0.05em;
font-size: 80%;
color: gray;
color: hsla(203,20%,40%,.7);
border-style: none;
background: transparent;
position: relative;
}
#toc-toggle-inline:hover:not(:active),
#toc-toggle-inline:focus:not(:active) {
text-shadow: 1px 1px silver;
top: -1px;
left: -1px;
}
#toc-nav :active {
color: #C00;
}
}
/** ToC Sidebar ***************************************************************/
/* Floating sidebar */
@media screen {
body.toc-sidebar #toc {
position: fixed;
top: 0; bottom: 0;
left: 0;
width: 23.5em;
max-width: 80%;
max-width: calc(100% - 2em - 26px);
overflow: auto;
padding: 0 1em;
padding-left: 42px;
padding-left: calc(1em + 26px);
background: inherit;
background-color: #f7f8f9;
z-index: 1;
box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
}
body.toc-sidebar #toc h2 {
margin-top: .8rem;
font-variant: small-caps;
font-variant: all-small-caps;
text-transform: lowercase;
font-weight: bold;
color: gray;
color: hsla(203,20%,40%,.7);
}
body.toc-sidebar #toc-jump:not(:focus) {
width: 0;
height: 0;
padding: 0;
position: absolute;
overflow: hidden;
}
}
/* Hide main scroller when only the ToC is visible anyway */
@media screen and (max-width: 28em) {
body.toc-sidebar {
overflow: hidden;
}
}
/* Sidebar with its own space */
@media screen and (min-width: 78em) {
body:not(.toc-inline) #toc {
position: fixed;
top: 0; bottom: 0;
left: 0;
width: 23.5em;
overflow: auto;
padding: 0 1em;
padding-left: 42px;
padding-left: calc(1em + 26px);
background: inherit;
background-color: #f7f8f9;
z-index: 1;
box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
}
body:not(.toc-inline) #toc h2 {
margin-top: .8rem;
font-variant: small-caps;
font-variant: all-small-caps;
text-transform: lowercase;
font-weight: bold;
color: gray;
color: hsla(203,20%,40%,.7);
}
body:not(.toc-inline) {
padding-left: 29em;
}
/* See also Overflow section at the bottom */
body:not(.toc-inline) #toc-jump:not(:focus) {
width: 0;
height: 0;
padding: 0;
position: absolute;
overflow: hidden;
}
}
@media screen and (min-width: 90em) {
body:not(.toc-inline) {
margin: 0 4em;
}
}
/******************************************************************************/
/* Sectioning */
/******************************************************************************/
/** Headings ******************************************************************/
h1, h2, h3, h4, h5, h6, dt {
page-break-after: avoid;
page-break-inside: avoid;
font: 100% sans-serif; /* Reset all font styling to clear out UA styles */
font-family: inherit; /* Inherit the font family. */
line-height: 1.2; /* Keep wrapped headings compact */
hyphens: manual; /* Hyphenated headings look weird */
}
h2, h3, h4, h5, h6 {
margin-top: 3rem;
}
h1, h2, h3 {
color: #005A9C;
background: transparent;
}
h1 { font-size: 170%; }
h2 { font-size: 140%; }
h3 { font-size: 120%; }
h4 { font-weight: bold; }
h5 { font-style: italic; }
h6 { font-variant: small-caps; }
dt { font-weight: bold; }
/** Subheadings ***************************************************************/
h1 + h2,
#subtitle {
/* #subtitle is a subtitle in an H2 under the H1 */
margin-top: 0;
}
h2 + h3,
h3 + h4,
h4 + h5,
h5 + h6 {
margin-top: 1.2em; /* = 1 x line-height */
}
/** Section divider ***********************************************************/
:not(.head) > hr {
font-size: 1.5em;
text-align: center;
margin: 1em auto;
height: auto;
border: transparent solid 0;
background: transparent;
}
:not(.head) > hr::before {
content: "\2727\2003\2003\2727\2003\2003\2727";
}
/******************************************************************************/
/* Paragraphs and Lists */
/******************************************************************************/
p {
margin: 1em 0;
}
dd > p:first-child,
li > p:first-child {
margin-top: 0;
}
ul, ol {
margin-left: 0;
padding-left: 2em;
}
li {
margin: 0.25em 0 0.5em;
padding: 0;
}
dl dd {
margin: 0 0 .5em 2em;
}
.head dd + dd { /* compact for header */
margin-top: -.5em;
}
/* Style for algorithms */
ol.algorithm ol:not(.algorithm),
.algorithm > ol ol:not(.algorithm) {
border-left: 0.5em solid #DEF;
}
/* Put nice boxes around each algorithm. */
[data-algorithm]:not(.heading) {
padding: .5em;
border: thin solid #ddd; border-radius: .5em;
margin: .5em calc(-0.5em - 1px);
}
[data-algorithm]:not(.heading) > :first-child {
margin-top: 0;
}
[data-algorithm]:not(.heading) > :last-child {
margin-bottom: 0;
}
/* Style for switch/case <dl>s */
dl.switch > dd > ol.only,
dl.switch > dd > .only > ol {
margin-left: 0;
}
dl.switch > dd > ol.algorithm,
dl.switch > dd > .algorithm > ol {
margin-left: -2em;
}
dl.switch {
padding-left: 2em;
}
dl.switch > dt {
text-indent: -1.5em;
margin-top: 1em;
}
dl.switch > dt + dt {
margin-top: 0;
}
dl.switch > dt::before {
content: '\21AA';
padding: 0 0.5em 0 0;
display: inline-block;
width: 1em;
text-align: right;
line-height: 0.5em;
}
/** Terminology Markup ********************************************************/
/******************************************************************************/
/* Inline Markup */
/******************************************************************************/
/** Terminology Markup ********************************************************/
dfn { /* Defining instance */
font-weight: bolder;
}
a > i { /* Instance of term */
font-style: normal;
}
dt dfn code, code.idl {
font-size: medium;
}
dfn var {
font-style: normal;
}
/** Change Marking ************************************************************/
del { color: red; text-decoration: line-through; }
ins { color: #080; text-decoration: underline; }
/** Miscellaneous improvements to inline formatting ***************************/
sup {
vertical-align: super;
font-size: 80%
}
/******************************************************************************/
/* Code */
/******************************************************************************/
/** General monospace/pre rules ***********************************************/
pre, code, samp {
font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
font-size: .9em;
page-break-inside: avoid;
hyphens: none;
text-transform: none;
}
pre code,
code code {
font-size: 100%;
}
pre {
margin-top: 1em;
margin-bottom: 1em;
overflow: auto;
}
/** Inline Code fragments *****************************************************/
/* Do something nice. */
/******************************************************************************/
/* Links */
/******************************************************************************/
/** General Hyperlinks ********************************************************/
/* We hyperlink a lot, so make it less intrusive */
a[href] {
color: #034575;
text-decoration: none;
border-bottom: 1px solid #707070;
/* Need a bit of extending for it to look okay */
padding: 0 1px 0;
margin: 0 -1px 0;
}
a:visited {
border-bottom-color: #BBB;
}
/* Use distinguishing colors when user is interacting with the link */
a[href]:focus,
a[href]:hover {
background: #f8f8f8;
background: rgba(75%, 75%, 75%, .25);
border-bottom-width: 3px;
margin-bottom: -2px;
}
a[href]:active {
color: #C00;
border-color: #C00;
}
/* Backout above styling for W3C logo */
.head .logo,
.head .logo a {
border: none;
text-decoration: none;
background: transparent;
}
/******************************************************************************/
/* Images */
/******************************************************************************/
img {
border-style: none;
}
/* For autogen numbers, add
.caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
*/
figure, .figure, .sidefigure {
page-break-inside: avoid;
text-align: center;
margin: 2.5em 0;
}
.figure img, .sidefigure img, figure img,
.figure object, .sidefigure object, figure object {
max-width: 100%;
margin: auto;
}
.figure pre, .sidefigure pre, figure pre {
text-align: left;
display: table;
margin: 1em auto;
}
.figure table, figure table {
margin: auto;
}
@media screen and (min-width: 20em) {
.sidefigure {
float: right;
width: 50%;
margin: 0 0 0.5em 0.5em
}
}
.caption, figcaption, caption {
font-style: italic;
font-size: 90%;
}
.caption::before, figcaption::before, figcaption > .marker {
font-weight: bold;
}
.caption, figcaption {
counter-increment: figure;
}
/* DL list is indented 2em, but figure inside it is not */
dd > .figure, dd > figure { margin-left: -2em }
/******************************************************************************/
/* Colored Boxes */
/******************************************************************************/
.issue, .note, .example, .assertion, .advisement, blockquote {
padding: .5em;
border: .5em;
border-left-style: solid;
page-break-inside: avoid;
}
span.issue, span.note {
padding: .1em .5em .15em;
border-right-style: solid;
}
.issue,
.note,
.example,
.advisement,
.assertion,
blockquote {
margin: 1em auto;
}
.note > p:first-child,
.issue > p:first-child,
blockquote > :first-child {
margin-top: 0;
}
blockquote > :last-child {
margin-bottom: 0;
}
/** Blockquotes ***************************************************************/
blockquote {
border-color: silver;
}
/** Open issue ****************************************************************/
.issue {
border-color: #E05252;
background: #FBE9E9;
counter-increment: issue;
overflow: auto;
}
.issue::before, .issue > .marker {
text-transform: uppercase;
color: #AE1E1E;
padding-right: 1em;
text-transform: uppercase;
}
/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
or use class="marker" to mark up the issue number in source. */
/** Example *******************************************************************/
.example {
border-color: #E0CB52;
background: #FCFAEE;
counter-increment: example;
overflow: auto;
clear: both;
}
.example::before, .example > .marker {
text-transform: uppercase;
color: #827017;
min-width: 7.5em;
display: block;
}
/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
or use class="marker" to mark up the example number in source. */
/** Non-normative Note ********************************************************/
.note {
border-color: #52E052;
background: #E9FBE9;
overflow: auto;
}
.note::before, .note > .marker,
details.note > summary::before,
details.note > summary > .marker {
text-transform: uppercase;
display: block;
color: hsl(120, 70%, 30%);
}
/* Add .note::before { content: "Note"; } for autogen label,
or use class="marker" to mark up the label in source. */
details.note > summary {
display: block;
color: hsl(120, 70%, 30%);
}
details.note[open] > summary {
border-bottom: 1px silver solid;
}
/** Assertion Box *************************************************************/
/* for assertions in algorithms */
.assertion {
border-color: #AAA;
background: #EEE;
}
/** Advisement Box ************************************************************/
/* for attention-grabbing normative statements */
.advisement {
border-color: orange;
border-style: none solid;
background: #FFEECC;
}
strong.advisement {
display: block;
text-align: center;
}
.advisement > .marker {
color: #B35F00;
}
/** Spec Obsoletion Notice ****************************************************/
/* obnoxious obsoletion notice for older/abandoned specs. */
details {
display: block;
}
summary {
font-weight: bolder;
}
.annoying-warning:not(details),
details.annoying-warning:not([open]) > summary,
details.annoying-warning[open] {
background: #fdd;
color: red;
font-weight: bold;
padding: .75em 1em;
border: thick red;
border-style: solid;
border-radius: 1em;
}
.annoying-warning :last-child {
margin-bottom: 0;
}
@media not print {
details.annoying-warning[open] {
position: fixed;
left: 1em;
right: 1em;
bottom: 1em;
z-index: 1000;
}
}
details.annoying-warning:not([open]) > summary {
text-align: center;
}
/** Entity Definition Boxes ***************************************************/
.def {
padding: .5em 1em;
background: #DEF;
margin: 1.2em 0;
border-left: 0.5em solid #8CCBF2;
}
/******************************************************************************/
/* Tables */
/******************************************************************************/
th, td {
text-align: left;
text-align: start;
}
/** Property/Descriptor Definition Tables *************************************/
table.def {
/* inherits .def box styling, see above */
width: 100%;
border-spacing: 0;
}
table.def td,
table.def th {
padding: 0.5em;
vertical-align: baseline;
border-bottom: 1px solid #bbd7e9;
}
table.def > tbody > tr:last-child th,
table.def > tbody > tr:last-child td {
border-bottom: 0;
}
table.def th {
font-style: italic;
font-weight: normal;
padding-left: 1em;
width: 3em;
}
/* For when values are extra-complex and need formatting for readability */
table td.pre {
white-space: pre-wrap;
}
/* A footnote at the bottom of a def table */
table.def td.footnote {
padding-top: 0.6em;
}
table.def td.footnote::before {
content: " ";
display: block;
height: 0.6em;
width: 4em;
border-top: thin solid;
}
/** Data tables (and properly marked-up index tables) *************************/
/*
<table class="data"> highlights structural relationships in a table
when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)
Use class="complex data" for particularly complicated tables --
(This will draw more lines: busier, but clearer.)
Use class="long" on table cells with paragraph-like contents
(This will adjust text alignment accordingly.)
Alternately use class="longlastcol" on tables, to have the last column assume "long".
*/
table {
word-wrap: normal;
overflow-wrap: normal;
hyphens: manual;
}
table.data,
table.index {
margin: 1em auto;
border-collapse: collapse;
border: hidden;
width: 100%;
}
table.data caption,
table.index caption {
max-width: 50em;
margin: 0 auto 1em;
}
table.data td, table.data th,
table.index td, table.index th {
padding: 0.5em 1em;
border-width: 1px;
border-color: silver;
border-top-style: solid;
}
table.data thead td:empty {
padding: 0;
border: 0;
}
table.data thead,
table.index thead,
table.data tbody,
table.index tbody {
border-bottom: 2px solid;
}
table.data colgroup,
table.index colgroup {
border-left: 2px solid;
}
table.data tbody th:first-child,
table.index tbody th:first-child {
border-right: 2px solid;
border-top: 1px solid silver;
padding-right: 1em;
}
table.data th[colspan],
table.data td[colspan] {
text-align: center;
}
table.complex.data th,
table.complex.data td {
border: 1px solid silver;
text-align: center;
}
table.data.longlastcol td:last-child,
table.data td.long {
vertical-align: baseline;
text-align: left;
}
table.data img {
vertical-align: middle;
}
/*
Alternate table alignment rules
table.data,
table.index {
text-align: center;
}
table.data thead th[scope="row"],
table.index thead th[scope="row"] {
text-align: right;
}
table.data tbody th:first-child,
table.index tbody th:first-child {
text-align: right;
}
Possible extra rowspan handling
table.data tbody th[rowspan]:not([rowspan='1']),
table.index tbody th[rowspan]:not([rowspan='1']),
table.data tbody td[rowspan]:not([rowspan='1']),
table.index tbody td[rowspan]:not([rowspan='1']) {
border-left: 1px solid silver;
}
table.data tbody th[rowspan]:first-child,
table.index tbody th[rowspan]:first-child,
table.data tbody td[rowspan]:first-child,
table.index tbody td[rowspan]:first-child{
border-left: 0;
border-right: 1px solid silver;
}
*/
/******************************************************************************/
/* Indices */
/******************************************************************************/
/** Table of Contents *********************************************************/
.toc a {
/* More spacing; use padding to make it part of the click target. */
padding-top: 0.1rem;
/* Larger, more consistently-sized click target */
display: block;
/* Reverse color scheme */
color: black;
border-color: #3980B5;
border-bottom-width: 3px !important;
margin-bottom: 0px !important;
}
.toc a:visited {
border-color: #054572;
}
.toc a:not(:focus):not(:hover) {
/* Allow colors to cascade through from link styling */
border-bottom-color: transparent;
}
.toc, .toc ol, .toc ul, .toc li {
list-style: none; /* Numbers must be inlined into source */
/* because generated content isn't search/selectable and markers can't do multilevel yet */
margin: 0;
padding: 0;
line-height: 1.1rem; /* consistent spacing */
}
/* ToC not indented until third level, but font style & margins show hierarchy */
.toc > li { font-weight: bold; }
.toc > li li { font-weight: normal; }
.toc > li li li { font-size: 95%; }
.toc > li li li li { font-size: 90%; }
.toc > li li li li .secno { font-size: 85%; }
.toc > li li li li li { font-size: 85%; }
.toc > li li li li li .secno { font-size: 100%; }
/* @supports not (display:grid) { */
.toc > li { margin: 1.5rem 0; }
.toc > li li { margin: 0.3rem 0; }
.toc > li li li { margin-left: 2rem; }
/* Section numbers in a column of their own */
.toc .secno {
float: left;
width: 4rem;
white-space: nowrap;
}
.toc li {
clear: both;
}
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<body class="h-entry">
<div class="head">
<p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2016/logos/W3C" width="72"> </a> </p>
<h1 class="p-name no-ref" id="title">Trusted Types</h1>
<h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft, <time class="dt-updated" datetime="2020-10-21">21 October 2020</time></span></h2>
<div data-fill-with="spec-metadata">
<dl>
<dt>This version:
<dd><a class="u-url" href="https://w3c.github.io/webappsec-trusted-types/dist/spec/">https://w3c.github.io/webappsec-trusted-types/dist/spec/</a>
<dt>Feedback:
<dd><span><a href="mailto:public-webappsec@w3.org?subject=%5Btrusted-types%5D%20YOUR%20TOPIC%20HERE">public-webappsec@w3.org</a> with subject line “<kbd>[trusted-types] <i data-lt>… message topic …</i></kbd>” (<a href="https://lists.w3.org/Archives/Public/public-webappsec/" rel="discussion">archives</a>)</span>
<dt>Issue Tracking:
<dd><a href="https://github.com/w3c/webappsec-trusted-types/issues/">GitHub</a>
<dd><a href="#issues-index">Inline In Spec</a>
<dt class="editor">Editors:
<dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:koto@google.com">Krzysztof Kotowicz</a> (<a class="p-org org" href="https://google.com">Google LLC</a>)
<dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:mkwst@google.com">Mike West</a> (<a class="p-org org" href="https://google.com">Google LLC</a>)
</dl>
</div>
<div data-fill-with="warning"></div>
<p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2020 <a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>, <a href="https://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply. </p>
<hr title="Separator for header">
</div>
<div class="p-summary" data-fill-with="abstract">
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<p>An API that allows applications to lock down powerful APIs to only accept non-spoofable, typed values in place of strings to prevent vulnerabilities caused by using these APIs with attacker-controlled inputs.</p>
</div>
<h2 class="no-num no-toc no-ref heading settled" id="status"><span class="content">Status of this document</span></h2>
<div data-fill-with="status">
<p> This is a public copy of the editors’ draft.
It is provided for discussion only and may change at any moment.
Its publication here does not imply endorsement of its contents by W3C.
Don’t cite this document other than as work in progress. </p>
<p> <strong>Changes to this document may be tracked at <a href="https://github.com/w3c/webappsec">https://github.com/w3c/webappsec</a>.</strong> </p>
<p> The (<a href="https://lists.w3.org/Archives/Public/public-webappsec/">archived</a>) public mailing list <a href="mailto:public-webappsec@w3.org?Subject=%5Btrusted-types%5D%20PUT%20SUBJECT%20HERE">public-webappsec@w3.org</a> (see <a href="https://www.w3.org/Mail/Request">instructions</a>)
is preferred for discussion of this specification.
When sending e-mail,
please put the text “trusted-types” in the subject,
preferably like this:
“[trusted-types] <em>…summary of comment…</em>” </p>
<p> This document was produced by the <a href="https://www.w3.org/2011/webappsec/">Web Application Security Working Group</a>. </p>
<p> This document was produced by a group operating under
the <a href="https://www.w3.org/Consortium/Patent-Policy/">W3C Patent Policy</a>.
W3C maintains a <a href="https://www.w3.org/2004/01/pp-impl/49309/status" rel="disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group;
that page also includes instructions for disclosing a patent.
An individual who has actual knowledge of a patent which the individual believes contains <a href="https://www.w3.org/Consortium/Patent-Policy/#def-essential">Essential Claim(s)</a> must disclose the information in accordance with <a href="https://www.w3.org/Consortium/Patent-Policy/#sec-Disclosure">section 6 of the W3C Patent Policy</a>. </p>
<p> This document is governed by the <a href="https://www.w3.org/2019/Process-20190301/" id="w3c_process_revision">1 March 2019 W3C Process Document</a>. </p>
<p></p>
</div>
<div data-fill-with="at-risk"></div>
<nav data-fill-with="table-of-contents" id="toc">
<h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
<ol class="toc" role="directory">
<li>
<a href="#introduction"><span class="secno">1</span> <span class="content">Introduction</span></a>
<ol class="toc">
<li><a href="#goals"><span class="secno">1.1</span> <span class="content">Goals</span></a>
<li><a href="#non-goals"><span class="secno">1.2</span> <span class="content">Non-goals</span></a>
<li><a href="#use-cases"><span class="secno">1.3</span> <span class="content">Use cases</span></a>
</ol>
<li>
<a href="#framework"><span class="secno">2</span> <span class="content">Framework</span></a>
<ol class="toc">
<li>
<a href="#injection-sinks"><span class="secno">2.1</span> <span class="content">Injection sinks</span></a>
<ol class="toc">
<li><a href="#html-injection-sinks"><span class="secno">2.1.1</span> <span class="content">HTML injection sinks</span></a>
<li><a href="#dom-xss-injection-sinks"><span class="secno">2.1.2</span> <span class="content">DOM XSS injection sinks</span></a>
</ol>
<li>
<a href="#trusted-types"><span class="secno">2.2</span> <span class="content">Trusted Types</span></a>
<ol class="toc">
<li><a href="#trusted-html"><span class="secno">2.2.1</span> <span class="content"><span>TrustedHTML</span></span></a>
<li><a href="#trusted-script"><span class="secno">2.2.2</span> <span class="content"><span>TrustedScript</span></span></a>
<li><a href="#trused-script-url"><span class="secno">2.2.3</span> <span class="content"><span>TrustedScriptURL</span></span></a>
</ol>
<li>
<a href="#policies-hdr"><span class="secno">2.3</span> <span class="content"><span>Policies</span></span></a>
<ol class="toc">
<li><a href="#trusted-type-policy-factory"><span class="secno">2.3.1</span> <span class="content"><span>TrustedTypePolicyFactory</span></span></a>
<li><a href="#trusted-type-policy"><span class="secno">2.3.2</span> <span class="content"><span>TrustedTypePolicy</span></span></a>
<li><a href="#trusted-type-policy-options"><span class="secno">2.3.3</span> <span class="content"><span>TrustedTypePolicyOptions</span></span></a>
<li><a href="#default-policy-hdr"><span class="secno">2.3.4</span> <span class="content"><span>Default policy</span></span></a>
</ol>
<li>
<a href="#enforcement-hdr"><span class="secno">2.4</span> <span class="content"><span>Enforcement</span></span></a>
<ol class="toc">
<li><a href="#content-security-policy-hdr"><span class="secno">2.4.1</span> <span class="content">Content Security Policy</span></a>
</ol>
</ol>
<li>
<a href="#algorithms"><span class="secno">3</span> <span class="content">Algorithms</span></a>
<ol class="toc">
<li><a href="#create-trusted-type-policy-algorithm"><span class="secno">3.1</span> <span class="content"><span>Create a Trusted Type Policy</span></span></a>
<li><a href="#create-a-trusted-type-algorithm"><span class="secno">3.2</span> <span class="content"><span>Create a Trusted Type</span></span></a>
<li><a href="#get-trusted-type-compliant-string-algorithm"><span class="secno">3.3</span> <span class="content"><span>Get Trusted Type compliant string</span></span></a>
<li><a href="#process-value-with-a-default-policy-algorithm"><span class="secno">3.4</span> <span class="content"><span>Process value with a default policy</span></span></a>
<li><a href="#prepare-script-url-and-text"><span class="secno">3.5</span> <span class="content"><span>Prepare the script URL and text</span></span></a>
</ol>
<li>
<a href="#integrations"><span class="secno">4</span> <span class="content">Integrations</span></a>
<ol class="toc">
<li>
<a href="#webidl-integration"><span class="secno">4.1</span> <span class="content">Integration with WebIDL</span></a>
<ol class="toc">
<li><a href="#webidl-string-context-xattr"><span class="secno">4.1.1</span> <span class="content">[StringContext]</span></a>
<li><a href="#webidl-applicable-to-types"><span class="secno">4.1.2</span> <span class="content">Extended attributes applicable to types</span></a>
<li><a href="#webidl-type-conversion"><span class="secno">4.1.3</span> <span class="content">Type conversion</span></a>
<li><a href="#webidl-validate-the-string-in-context"><span class="secno">4.1.4</span> <span class="content">Validate the string in context</span></a>
</ol>
<li>
<a href="#integration-with-html"><span class="secno">4.2</span> <span class="content">Integration with HTML</span></a>
<ol class="toc">
<li><a href="#extensions-to-the-window-interface"><span class="secno">4.2.1</span> <span class="content">Extensions to the Window interface</span></a>
<li><a href="#extensions-to-the-document-interface"><span class="secno">4.2.2</span> <span class="content">Extensions to the Document interface</span></a>
<li>
<a href="#enforcement-in-scripts"><span class="secno">4.2.3</span> <span class="content">Enforcement for scripts</span></a>
<ol class="toc">
<li><a href="#slots-with-trusted-values"><span class="secno">4.2.3.1</span> <span class="content">Slots with trusted values</span></a>
<li><a href="#setting-slot-values"><span class="secno">4.2.3.2</span> <span class="content">Setting slot values</span></a>
<li><a href="#slot-value-verification"><span class="secno">4.2.3.3</span> <span class="content">Slot value verification</span></a>
</ol>
<li><a href="#enforcement-in-sinks"><span class="secno">4.2.4</span> <span class="content">Enforcement in element attributes</span></a>
<li><a href="#enforcement-in-timer-functions"><span class="secno">4.2.5</span> <span class="content">Enforcement in timer functions</span></a>
<li><a href="#enforcement-in-event-handler-con