# sanitize-html

sanitize-html provides a simple HTML sanitizer with a clear API. sanitize-html is tolerant. It is well suited for cleaning up HTML fragments such as those created by CKEditor and other rich text editors. It is especially handy for removing unwanted CSS when copying and pasting from Word. sanitize-html allows you to specify the tags you want to permit, and the permitted attributes for each of those tags. If an attribute is a known non-boolean value, and it is empty, it will be removed. For example `checked` can be empty, but `href` cannot. If a tag is not permitted, the contents of the tag are not discarded. There are some exceptions to this, discussed below in the "Discarding the entire contents of a disallowed tag" section. The syntax of poorly closed `p` and `img` elements is cleaned up. `href` attributes are validated to ensure they only contain `http`, `https`, `ftp` and `mailto` URLs. Relative URLs are also allowed. Ditto for `src` attributes. Allowing particular urls as a `src` to an iframe tag by filtering hostnames is also supported. HTML comments are not preserved. Additionally, `sanitize-html` escapes _ALL_ text content - this means that ampersands, greater-than, and less-than signs are converted to their equivalent HTML character references (`&` --> `&`, `<` --> `<`, and so on). Additionally, in attribute values, quotation marks are escaped as well (`"` --> `"`). ## Requirements sanitize-html is intended for use with Node.js and supports Node 10+. All of its npm dependencies are pure JavaScript. sanitize-html is built on the excellent `htmlparser2` module. ### Regarding TypeScript sanitize-html is not written in TypeScript and there is no plan to directly support it. There is a community supported typing definition, [`@types/sanitize-html`](https://www.npmjs.com/package/@types/sanitize-html), however. ```bash npm install -D @types/sanitize-html ``` If `esModuleInterop=true` is not set in your `tsconfig.json` file, you have to import it with: ```javascript import * as sanitizeHtml from 'sanitize-html'; ``` When using TypeScript, there is a minimum supported version of >=4.5 because of a dependency on the `htmlparser2` types. Any questions or problems while using `@types/sanitize-html` should be directed to its maintainers as directed by that project's contribution guidelines. ## How to use ### Browser *Think first: why do you want to use it in the browser?* Remember, *servers must never trust browsers.* You can't sanitize HTML for saving on the server anywhere else but on the server. But, perhaps you'd like to display sanitized HTML immediately in the browser for preview. Or ask the browser to do the sanitization work on every page load. You can if you want to! * Install the package: ```bash npm install sanitize-html ``` or ``` yarn add sanitize-html ``` The primary change in the 2.x version of sanitize-html is that it no longer includes a build that is ready for browser use. Developers are expected to include sanitize-html in their project builds (e.g., webpack) as they would any other dependency. So while sanitize-html is no longer ready to link to directly in HTML, developers can now more easily process it according to their needs. Once built and linked in the browser with other project Javascript, it can be used to sanitize HTML strings in front end code: ```javascript import sanitizeHtml from 'sanitize-html'; const html = "hello world"; console.log(sanitizeHtml(html)); console.log(sanitizeHtml("

")); console.log(sanitizeHtml("console.log('hello world')")); console.log(sanitizeHtml("")); ``` ### Node (Recommended) Install module from console: ```bash npm install sanitize-html ``` Import the module: ```js // In ES modules import sanitizeHtml from 'sanitize-html'; // Or in CommonJS const sanitizeHtml = require('sanitize-html'); ``` Use it in your JavaScript app: ```js const dirty = 'some really tacky HTML'; const clean = sanitizeHtml(dirty); ``` That will allow our [default list of allowed tags and attributes](#default-options) through. It's a nice set, but probably not quite what you want. So: ```js // Allow only a super restricted set of tags and attributes const clean = sanitizeHtml(dirty, { allowedTags: [ 'b', 'i', 'em', 'strong', 'a' ], allowedAttributes: { 'a': [ 'href' ] }, allowedIframeHostnames: ['www.youtube.com'] }); ``` Boom! ### Default options ```js allowedTags: [ "address", "article", "aside", "footer", "header", "h1", "h2", "h3", "h4", "h5", "h6", "hgroup", "main", "nav", "section", "blockquote", "dd", "div", "dl", "dt", "figcaption", "figure", "hr", "li", "main", "ol", "p", "pre", "ul", "a", "abbr", "b", "bdi", "bdo", "br", "cite", "code", "data", "dfn", "em", "i", "kbd", "mark", "q", "rb", "rp", "rt", "rtc", "ruby", "s", "samp", "small", "span", "strong", "sub", "sup", "time", "u", "var", "wbr", "caption", "col", "colgroup", "table", "tbody", "td", "tfoot", "th", "thead", "tr" ], nonBooleanAttributes: [ 'abbr', 'accept', 'accept-charset', 'accesskey', 'action', 'allow', 'alt', 'as', 'autocapitalize', 'autocomplete', 'blocking', 'charset', 'cite', 'class', 'color', 'cols', 'colspan', 'content', 'contenteditable', 'coords', 'crossorigin', 'data', 'datetime', 'decoding', 'dir', 'dirname', 'download', 'draggable', 'enctype', 'enterkeyhint', 'fetchpriority', 'for', 'form', 'formaction', 'formenctype', 'formmethod', 'formtarget', 'headers', 'height', 'hidden', 'high', 'href', 'hreflang', 'http-equiv', 'id', 'imagesizes', 'imagesrcset', 'inputmode', 'integrity', 'is', 'itemid', 'itemprop', 'itemref', 'itemtype', 'kind', 'label', 'lang', 'list', 'loading', 'low', 'max', 'maxlength', 'media', 'method', 'min', 'minlength', 'name', 'nonce', 'optimum', 'pattern', 'ping', 'placeholder', 'popover', 'popovertarget', 'popovertargetaction', 'poster', 'preload', 'referrerpolicy', 'rel', 'rows', 'rowspan', 'sandbox', 'scope', 'shape', 'size', 'sizes', 'slot', 'span', 'spellcheck', 'src', 'srcdoc', 'srclang', 'srcset', 'start', 'step', 'style', 'tabindex', 'target', 'title', 'translate', 'type', 'usemap', 'value', 'width', 'wrap', // Event handlers 'onauxclick', 'onafterprint', 'onbeforematch', 'onbeforeprint', 'onbeforeunload', 'onbeforetoggle', 'onblur', 'oncancel', 'oncanplay', 'oncanplaythrough', 'onchange', 'onclick', 'onclose', 'oncontextlost', 'oncontextmenu', 'oncontextrestored', 'oncopy', 'oncuechange', 'oncut', 'ondblclick', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'ondurationchange', 'onemptied', 'onended', 'onerror', 'onfocus', 'onformdata', 'onhashchange', 'oninput', 'oninvalid', 'onkeydown', 'onkeypress', 'onkeyup', 'onlanguagechange', 'onload', 'onloadeddata', 'onloadedmetadata', 'onloadstart', 'onmessage', 'onmessageerror', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onoffline', 'ononline', 'onpagehide', 'onpageshow', 'onpaste', 'onpause', 'onplay', 'onplaying', 'onpopstate', 'onprogress', 'onratechange', 'onreset', 'onresize', 'onrejectionhandled', 'onscroll', 'onscrollend', 'onsecuritypolicyviolation', 'onseeked', 'onseeking', 'onselect', 'onslotchange', 'onstalled', 'onstorage', 'onsubmit', 'onsuspend', 'ontimeupdate', 'ontoggle', 'onunhandledrejection', 'onunload', 'onvolumechange', 'onwaiting', 'onwheel' ], disallowedTagsMode: 'discard', allowedAttributes: { a: [ 'href', 'name', 'target' ], // We don't currently allow img itself by default, but // these attributes would make sense if we did. img: [ 'src', 'srcset', 'alt', 'title', 'width', 'height', 'loading' ] }, // Lots of these won't come up by default because we don't allow them selfClosing: [ 'img', 'br', 'hr', 'area', 'base', 'basefont', 'input', 'link', 'meta' ], // URL schemes we permit allowedSchemes: [ 'http', 'https', 'ftp', 'mailto', 'tel' ], allowedSchemesByTag: {}, allowedSchemesAppliedToAttributes: [ 'href', 'src', 'cite' ], allowProtocolRelative: true, enforceHtmlBoundary: false, parseStyleAttributes: true ``` ### Common use cases #### "I like your set but I want to add one more tag. Is there a convenient way?" Sure: ```js const clean = sanitizeHtml(dirty, { allowedTags: sanitizeHtml.defaults.allowedTags.concat([ 'img' ]) }); ``` If you do not specify `allowedTags` or `allowedAttributes`, our default list is applied. So if you really want an empty list, specify one. #### "What if I want to allow all tags or all attributes?" Simple! Instead of leaving `allowedTags` or `allowedAttributes` out of the options, set either one or both to `false`: ```js allowedTags: false, allowedAttributes: false ``` #### "What if I want to allow empty attributes, even for cases like href that normally don't make sense?" Very simple! Set `nonBooleanAttributes` to `[]`. ```js nonBooleanAttributes: [] ``` #### "What if I want to remove all empty attributes, including valid ones?" Also very simple! Set `nonBooleanAttributes` to `['*']`. **Note**: This will break common valid cases like `checked` and `selected`, so this is unlikely to be what you want. For most ordinary HTML use, it is best to avoid making this change. ```js nonBooleanAttributes: ['*'] ``` #### "What if I don't want to allow *any* tags?" Also simple! Set `allowedTags` to `[]` and `allowedAttributes` to `{}`. ```js allowedTags: [], allowedAttributes: {} ``` #### "What if I want disallowed tags to be escaped rather than discarded?" If you set `disallowedTagsMode` to `discard` (the default), disallowed tags are discarded. Any text content or subtags are still included, depending on whether the individual subtags are allowed. If you set `disallowedTagsMode` to `completelyDiscard`, disallowed tags and any content they contain are discarded. Any subtags are still included, as long as those individual subtags are allowed. If you set `disallowedTagsMode` to `escape`, the disallowed tags are escaped rather than discarded. Any text or subtags are handled normally. If you set `disallowedTagsMode` to `recursiveEscape`, the disallowed tags are escaped rather than discarded, and the same treatment is applied to all subtags, whether otherwise allowed or not. #### "What if I want to allow only specific values on some attributes?" When configuring the attribute in `allowedAttributes` simply use an object with attribute `name` and an allowed `values` array. In the following example `sandbox="allow-forms allow-modals allow-orientation-lock allow-pointer-lock allow-popups allow-popups-to-escape-sandbox allow-scripts"` would become `sandbox="allow-popups allow-scripts"`: ```js allowedAttributes: { iframe: [ { name: 'sandbox', multiple: true, values: ['allow-popups', 'allow-same-origin', 'allow-scripts'] } ] } ``` With `multiple: true`, several allowed values may appear in the same attribute, separated by spaces. Otherwise the attribute must exactly match one and only one of the allowed values. #### "What if I want to maintain the original case for SVG elements and attributes?" If you're incorporating SVG elements like `linearGradient` into your content and notice that they're not rendering as expected due to case sensitivity issues, it's essential to prevent `sanitize-html` from converting element and attribute names to lowercase. This situation often arises when SVGs fail to display correctly because their case-sensitive tags, such as `linearGradient` and attributes like `viewBox`, are inadvertently lowercased. To address this, ensure you set `lowerCaseTags: false` and `lowerCaseAttributeNames: false` in the parser options of your sanitize-html configuration. This adjustment stops the library from altering the case of your tags and attributes, preserving the integrity of your SVG content. ```js allowedTags: [ 'svg', 'g', 'defs', 'linearGradient', 'stop', 'circle' ], allowedAttributes: false, parser: { lowerCaseTags: false, lowerCaseAttributeNames: false } ``` ### Wildcards for attributes You can use the `*` wildcard to allow all attributes with a certain prefix: ```js allowedAttributes: { a: [ 'href', 'data-*' ] } ``` Also you can use the `*` as name for a tag, to allow listed attributes to be valid for any tag: ```js allowedAttributes: { '*': [ 'href', 'align', 'alt', 'center', 'bgcolor' ] } ``` ## Additional options ### Allowed CSS Classes If you wish to allow specific CSS classes on a particular element, you can do so with the `allowedClasses` option. Any other CSS classes are discarded. This implies that the `class` attribute is allowed on that element. ```javascript // Allow only a restricted set of CSS classes and only on the p tag const clean = sanitizeHtml(dirty, { allowedTags: [ 'p', 'em', 'strong' ], allowedClasses: { 'p': [ 'fancy', 'simple' ] } }); ``` Similar to `allowedAttributes`, you can use `*` to allow classes with a certain prefix, or use `*` as a tag name to allow listed classes to be valid for any tag: ```js allowedClasses: { 'code': [ 'language-*', 'lang-*' ], '*': [ 'fancy', 'simple' ] } ``` Furthermore, regular expressions are supported too: ```js allowedClasses: { p: [ /^regex\d{2}$/ ] } ``` If `allowedClasses` for a certain tag is `false`, all the classes for this tag will be allowed. > Note: It is advised that your regular expressions always begin with `^` so that you are requiring a known prefix. A regular expression with neither `^` nor `$` just requires that something appear in the middle. ### Allowed CSS Styles If you wish to allow specific CSS _styles_ on a particular element, you can do that with the `allowedStyles` option. Simply declare your desired attributes as regular expression options within an array for the given attribute. Specific elements will inherit allowlisted attributes from the global (`*`) attribute. Any other CSS classes are discarded. **You must also use `allowedAttributes`** to activate the `style` attribute for the relevant elements. Otherwise this feature will never come into play. **When constructing regular expressions, don't forget `^` and `$`.** It's not enough to say "the string should contain this." It must also say "and only this." **URLs in inline styles are NOT filtered by any mechanism other than your regular expression.** ```javascript const clean = sanitizeHtml(dirty, { allowedTags: ['p'], allowedAttributes: { 'p': ["style"], }, allowedStyles: { '*': { // Match HEX and RGB 'color': [/^#(0x)?[0-9a-f]+$/i, /^rgb$\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*$$/], 'text-align': [/^left$/, /^right$/, /^center$/], // Match any number with px, em, or % 'font-size': [/^\d+(?:px|em|%)$/] }, 'p': { 'font-size': [/^\d+rem$/] } } }); ``` ### Discarding text outside of `````` tags Some text editing applications generate HTML to allow copying over to a web application. These can sometimes include undesirable control characters after terminating `html` tag. By default sanitize-html will not discard these characters, instead returning them in sanitized string. This behaviour can be modified using `enforceHtmlBoundary` option. Setting this option to true will instruct sanitize-html to discard all characters outside of `html` tag boundaries -- before `` and after `` tags. ```js enforceHtmlBoundary: true ``` ### htmlparser2 Options sanitize-html is built on `htmlparser2`. By default the only option passed down is `decodeEntities: true`. You can set the options to pass by using the parser option. **Security note: changing the `parser` settings can be risky.** In particular, `decodeEntities: false` has known security concerns and a complete test suite does not exist for every possible combination of settings when used with `sanitize-html`. If security is your goal we recommend you use the defaults rather than changing `parser`, except for the `lowerCaseTags` option. ```javascript const clean = sanitizeHtml(dirty, { allowedTags: ['a'], parser: { lowerCaseTags: true } }); ``` See the [htmlparser2 wiki](https://github.com/fb55/htmlparser2/wiki/Parser-options) for the full list of possible options. ### Transformations What if you want to add or change an attribute? What if you want to transform one tag to another? No problem, it's simple! The easiest way (will change all `ol` tags to `ul` tags): ```js const clean = sanitizeHtml(dirty, { transformTags: { 'ol': 'ul', } }); ``` The most advanced usage: ```js const clean = sanitizeHtml(dirty, { transformTags: { 'ol': function(tagName, attribs) { // My own custom magic goes here return { tagName: 'ul', attribs: { class: 'foo' } }; } } }); ``` You can specify the `*` wildcard instead of a tag name to transform all tags. There is also a helper method which should be enough for simple cases in which you want to change the tag and/or add some attributes: ```js const clean = sanitizeHtml(dirty, { transformTags: { 'ol': sanitizeHtml.simpleTransform('ul', {class: 'foo'}), } }); ``` The `simpleTransform` helper method has 3 parameters: ```js simpleTransform(newTag, newAttributes, shouldMerge) ``` The last parameter (`shouldMerge`) is set to `true` by default. When `true`, `simpleTransform` will merge the current attributes with the new ones (`newAttributes`). When `false`, all existing attributes are discarded. You can also add or modify the text contents of a tag: ```js const clean = sanitizeHtml(dirty, { transformTags: { 'a': function(tagName, attribs) { return { tagName: 'a', text: 'Some text' }; } } }); ``` For example, you could transform a link element with missing anchor text: ```js ``` To a link with anchor text: ```js Some text ``` ### Filters You can provide a filter function to remove unwanted tags. Let's suppose we need to remove empty `a` tags like: ```html ``` We can do that with the following filter: ```js sanitizeHtml( '

This is
Linux

', { exclusiveFilter: function(frame) { return frame.tag === 'a' && !frame.text.trim(); } } ); ``` The `frame` object supplied to the callback provides the following attributes: - `tag`: The tag name, i.e. `'img'`. - `attribs`: The tag's attributes, i.e. `{ src: "/path/to/tux.png" }`. - `text`: The text content of the tag. - `mediaChildren`: Immediate child tags that are likely to represent self-contained media (e.g., `img`, `video`, `picture`, `iframe`). See the `mediaTags` variable in `src/index.js` for the full list. - `tagPosition`: The index of the tag's position in the result string. You can also process all text content with a provided filter function. Let's say we want an ellipsis instead of three dots. ```html

some text...

``` We can do that with the following filter: ```js sanitizeHtml( '

some text...

', { textFilter: function(text, tagName) { if (['a'].indexOf(tagName) > -1) return //Skip anchor tags return text.replace(/\.\.\./, '…'); } } ); ``` Note that the text passed to the `textFilter` method is already escaped for safe display as HTML. You may add markup and use entity escape sequences in your `textFilter`. ### Iframe Filters If you would like to allow iframe tags but want to control the domains that are allowed through, you can provide an array of hostnames and/or array of domains that you would like to allow as iframe sources. This hostname is a property in the options object passed as an argument to the sanitize-html function. These arrays will be checked against the html that is passed to the function and return only `src` urls that include the allowed hostnames or domains in the object. The url in the html that is passed must be formatted correctly (valid hostname) as an embedded iframe otherwise the module will strip out the src from the iframe. Make sure to pass a valid hostname along with the domain you wish to allow, i.e.: ```js allowedIframeHostnames: ['www.youtube.com', 'player.vimeo.com'], allowedIframeDomains: ['zoom.us'] ``` You may also specify whether or not to allow relative URLs as iframe sources. ```js allowIframeRelativeUrls: true ``` Note that if unspecified, relative URLs will be allowed by default if no hostname or domain filter is provided but removed by default if a hostname or domain filter is provided. **Remember that the `iframe` tag must be allowed as well as the `src` attribute.** For example: ```javascript const clean = sanitizeHtml('

', { allowedTags: [ 'p', 'em', 'strong', 'iframe' ], allowedClasses: { 'p': [ 'fancy', 'simple' ], }, allowedAttributes: { 'iframe': ['src'] }, allowedIframeHostnames: ['www.youtube.com', 'player.vimeo.com'] }); ``` will return an empty iframe tag. If you want to allow any subdomain of any level you can provide the domain in `allowedIframeDomains` ```javascript // This iframe markup will pass through as safe. const clean = sanitizeHtml('

', { allowedTags: [ 'p', 'em', 'strong', 'iframe' ], allowedClasses: { 'p': [ 'fancy', 'simple' ], }, allowedAttributes: { 'iframe': ['src'] }, allowedIframeHostnames: ['www.youtube.com', 'player.vimeo.com'], allowedIframeDomains: ['zoom.us'] }); ``` ### Script Filters Similarly to iframes you can allow a script tag on a list of allowlisted domains ```js const clean = sanitizeHtml('', { allowedTags: ['script'], allowedAttributes: { script: ['src'] }, allowedScriptDomains: ['authorized.com'], }) ``` You can allow a script tag on a list of allowlisted hostnames too ```js const clean = sanitizeHtml('', { allowedTags: ['script'], allowedAttributes: { script: ['src'] }, allowedScriptHostnames: [ 'www.authorized.com' ], }) ``` ### Allowed URL schemes By default, we allow the following URL schemes in cases where `href`, `src`, etc. are allowed: ```js [ 'http', 'https', 'ftp', 'mailto' ] ``` You can override this if you want to: ```js sanitizeHtml( // teeny-tiny valid transparent GIF in a data URL '', { allowedTags: [ 'img', 'p' ], allowedSchemes: [ 'data', 'http' ] } ); ``` You can also allow a scheme for a particular tag only: ```js allowedSchemes: [ 'http', 'https' ], allowedSchemesByTag: { img: [ 'data' ] } ``` And you can forbid the use of protocol-relative URLs (starting with `//`) to access another site using the current protocol, which is allowed by default: ```js allowProtocolRelative: false ``` ### Discarding the entire contents of a disallowed tag Normally, with a few exceptions, if a tag is not allowed, all of the text within it is preserved, and so are any allowed tags within it. The exceptions are: `style`, `script`, `textarea`, `option` If you wish to replace this list, for instance to discard whatever is found inside a `noscript` tag, use the `nonTextTags` option: ```js nonTextTags: [ 'style', 'script', 'textarea', 'option', 'noscript' ] ``` Note that if you use this option you are responsible for stating the entire list. This gives you the power to retain the content of `textarea`, if you want to. The content still gets escaped properly, with the exception of the `script` and `style` tags. *Allowing either `script` or `style` leaves you open to XSS attacks. Don't do that* unless you have good reason to trust their origin. sanitize-html will log a warning if these tags are allowed, which can be disabled with the `allowVulnerableTags: true` option. ### Choose what to do with disallowed tags Instead of discarding, or keeping text only, you may enable escaping of the entire content: ```js disallowedTagsMode: 'escape' ``` This will transform `content` to `<disallowed>content</disallowed>` Valid values are: `'discard'` (default), `'completelyDiscard'` (remove disallowed tag's content), `'escape'` (escape the tag) and `'recursiveEscape'` (to escape the tag and all its content). #### Discard disallowed but but the inner content of disallowed tags is kept. If you set `disallowedTagsMode` to `discard`, disallowed tags are discarded but but the inner content of disallowed tags is kept. ```js disallowedTagsMode: 'discard' ``` This will transform `content` to `content` #### Discard entire content of a disallowed tag If you set `disallowedTagsMode` to `completelyDiscard`, disallowed tags and any content they contain are discarded. Any subtags are still included, as long as those individual subtags are allowed. ```js disallowedTagsMode: 'completelyDiscard' ``` This will transform `content content ` to `content` #### Escape the disallowed tag and all its children even for allowed tags. if you set `disallowedTagsMode` to `recursiveEscape`, disallowed tag and its children will be escaped even for allowed tags ```js disallowedTagsMode: `recursiveEscape` ``` This will transform `hello

world

` to `<disallowed>hello<p>world</p></disallowed>` ### Ignore style attribute contents Instead of discarding faulty style attributes, you can allow them by disabling the parsing of style attributes: ```js parseStyleAttributes: false ``` This will transform `

content

` to `

content

` instead of stripping it: `

content

` By default the parseStyleAttributes option is true. When you disable parsing of the style attribute (`parseStyleAttributes: false`) and you pass in options for the allowedStyles property, an error will be thrown. This combination is not permitted. we recommend sanitizing content server-side in a Node.js environment, as you cannot trust a browser to sanitize things anyway. Consider what a malicious user could do via the network panel, the browser console, or just by writing scripts that submit content similar to what your JavaScript submits. But if you really need to run it on the client in the browser, you may find you need to disable parseStyleAttributes. This is subject to change as it is [an upstream issue with postcss](https://github.com/postcss/postcss/issues/1727), not sanitize-html itself. ### Restricting deep nesting You can limit the depth of HTML tags in the document with the `nestingLimit` option: ```javascript nestingLimit: 6 ``` This will prevent the user from nesting tags more than 6 levels deep. Tags deeper than that are stripped out exactly as if they were disallowed. Note that this means text is preserved in the usual ways where appropriate. ## About ApostropheCMS sanitize-html was created at [P'unk Avenue](https://punkave.com) for use in [ApostropheCMS](https://apostrophecms.com), an open-source content management system built on Node.js. If you like sanitize-html you should definitely check out ApostropheCMS. ## Support Feel free to open issues on [github](https://github.com/apostrophecms/sanitize-html).

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