foo
', {\n removeAttributeQuotes: true,\n});\nresult; // 'foo
'\n```\n\nSee [corresponding blog post](http://perfectionkills.com/experimenting-with-html-minifier) for all the gory details of [how it works](http://perfectionkills.com/experimenting-with-html-minifier#how_it_works), [description of each option](http://perfectionkills.com/experimenting-with-html-minifier#options), [testing results](http://perfectionkills.com/experimenting-with-html-minifier#field_testing) and [conclusions](http://perfectionkills.com/experimenting-with-html-minifier#cost_and_benefits).\n\nAlso see corresponding [Ruby wrapper](https://github.com/stereobooster/html_minifier), and for Node.js, [Grunt plugin](https://github.com/gruntjs/grunt-contrib-htmlmin), [Gulp plugin](https://github.com/pioug/gulp-html-minifier-terser), [Koa middleware wrapper](https://github.com/koajs/html-minifier) and [Express middleware wrapper](https://github.com/melonmanchan/express-minify-html).\n\nFor lint-like capabilities take a look at [HTMLLint](https://github.com/kangax/html-lint).\n\n## Minification comparison\n\nHow does HTMLMinifier compare to other solutions ā [HTML Minifier from Will Peavy](http://www.willpeavy.com/minifier/) (1st result in [Google search for \"html minifier\"](https://www.google.com/#q=html+minifier)) as well as [htmlcompressor.com](http://htmlcompressor.com) and [minimize](https://github.com/Swaagie/minimize)?\n\n| Site | Original size *(KB)* | HTMLMinifier | minimize | Will Peavy | htmlcompressor.com |\n| ---------------------------------------------------------------------------- |:--------------------:| ------------:| --------:| ----------:| ------------------:|\n| [Google](https://www.google.com/) | 52 | **48** | 52 | 54 | n/a |\n| [Stack Overflow](https://stackoverflow.com/) | 177 | **143** | 154 | 154 | n/a |\n| [HTMLMinifier](https://github.com/kangax/html-minifier) | 252 | **171** | 230 | 250 | n/a |\n| [Bootstrap CSS](https://getbootstrap.com/docs/3.3/css/) | 271 | **260** | 269 | 229 | n/a |\n| [BBC](https://www.bbc.co.uk/) | 355 | **324** | 353 | 344 | n/a |\n| [Amazon](https://www.amazon.co.uk/) | 466 | **430** | 456 | 474 | n/a |\n| [Twitter](https://twitter.com/) | 469 | **394** | 462 | 513 | n/a |\n| [Wikipedia](https://en.wikipedia.org/wiki/President_of_the_United_States) | 703 | **569** | 682 | 708 | n/a |\n| [Eloquent Javascript](https://eloquentjavascript.net/1st_edition/print.html) | 870 | **815** | 840 | 864 | n/a |\n| [NBC](https://www.nbc.com/) | 1701 | **1566** | 1689 | 1705 | n/a |\n| [New York Times](https://www.nytimes.com/) | 1731 | **1583** | 1726 | 1680 | n/a |\n| [ES draft](https://tc39.github.io/ecma262/) | 6296 | **5538** | 5733 | n/a | n/a |\n\n## Options Quick Reference\n\nMost of the options are disabled by default.\n\n| Option | Description | Default |\n|--------------------------------|-----------------|---------|\n| `caseSensitive` | Treat attributes in case sensitive manner (useful for custom HTML tags) | `false` |\n| `collapseBooleanAttributes` | [Omit attribute values from boolean attributes](http://perfectionkills.com/experimenting-with-html-minifier#collapse_boolean_attributes) | `false` |\n| `collapseInlineTagWhitespace` | Don't leave any spaces between `display:inline;` elements when collapsing. Must be used in conjunction with `collapseWhitespace=true` | `false` |\n| `collapseWhitespace` | [Collapse white space that contributes to text nodes in a document tree](http://perfectionkills.com/experimenting-with-html-minifier#collapse_whitespace) | `false` |\n| `conservativeCollapse` | Always collapse to 1 space (never remove it entirely). Must be used in conjunction with `collapseWhitespace=true` | `false` |\n| `continueOnParseError` | [Handle parse errors](https://html.spec.whatwg.org/multipage/parsing.html#parse-errors) instead of aborting. | `false` |\n| `customAttrAssign` | Arrays of regex'es that allow to support custom attribute assign expressions (e.g. `''`) | `[ ]` |\n| `customAttrCollapse` | Regex that specifies custom attribute to strip newlines from (e.g. `/ng-class/`) | |\n| `customAttrSurround` | Arrays of regex'es that allow to support custom attribute surround expressions (e.g. ``) | `[ ]` |\n| `customEventAttributes` | Arrays of regex'es that allow to support custom event attributes for `minifyJS` (e.g. `ng-click`) | `[ /^on[a-z]{3,}$/ ]` |\n| `decodeEntities` | Use direct Unicode characters whenever possible | `false` |\n| `html5` | Parse input according to HTML5 specifications | `true` |\n| `ignoreCustomComments` | Array of regex'es that allow to ignore certain comments, when matched | `[ /^!/, /^\\s*#/ ]` |\n| `ignoreCustomFragments` | Array of regex'es that allow to ignore certain fragments, when matched (e.g. ``, `{{ ... }}`, etc.) | `[ /<%[\\s\\S]*?%>/, /<\\?[\\s\\S]*?\\?>/ ]` |\n| `includeAutoGeneratedTags` | Insert tags generated by HTML parser | `true` |\n| `keepClosingSlash` | Keep the trailing slash on singleton elements | `false` |\n| `maxLineLength` | Specify a maximum line length. Compressed output will be split by newlines at valid HTML split-points |\n| `minifyCSS` | Minify CSS in style elements and style attributes (uses [clean-css](https://github.com/jakubpawlowicz/clean-css)) | `false` (could be `true`, `Object`, `Function(text, type)`) |\n| `minifyJS` | Minify JavaScript in script elements and event attributes (uses [Terser](https://github.com/terser/terser)) | `false` (could be `true`, `Object`, `Function(text, inline)`) |\n| `minifyURLs` | Minify URLs in various attributes (uses [relateurl](https://github.com/stevenvachon/relateurl)) | `false` (could be `String`, `Object`, `Function(text)`) |\n| `noNewlinesBeforeTagClose` | Never add a newline before a tag that closes an element | `false` |\n| `preserveLineBreaks` | Always collapse to 1 line break (never remove it entirely) when whitespace between tags include a line break. Must be used in conjunction with `collapseWhitespace=true` | `false` |\n| `preventAttributesEscaping` | Prevents the escaping of the values of attributes | `false` |\n| `processConditionalComments` | Process contents of conditional comments through minifier | `false` |\n| `processScripts` | Array of strings corresponding to types of script elements to process through minifier (e.g. `text/ng-template`, `text/x-handlebars-template`, etc.) | `[ ]` |\n| `quoteCharacter` | Type of quote to use for attribute values (' or \") | |\n| `removeAttributeQuotes` | [Remove quotes around attributes when possible](http://perfectionkills.com/experimenting-with-html-minifier#remove_attribute_quotes) | `false` |\n| `removeComments` | [Strip HTML comments](http://perfectionkills.com/experimenting-with-html-minifier#remove_comments) | `false` |\n| `removeEmptyAttributes` | [Remove all attributes with whitespace-only values](http://perfectionkills.com/experimenting-with-html-minifier#remove_empty_or_blank_attributes) | `false` (could be `true`, `Function(attrName, tag)`) |\n| `removeEmptyElements` | [Remove all elements with empty contents](http://perfectionkills.com/experimenting-with-html-minifier#remove_empty_elements) | `false` |\n| `removeOptionalTags` | [Remove optional tags](http://perfectionkills.com/experimenting-with-html-minifier#remove_optional_tags) | `false` |\n| `removeRedundantAttributes` | [Remove attributes when value matches default.](http://perfectionkills.com/experimenting-with-html-minifier#remove_redundant_attributes) | `false` |\n| `removeScriptTypeAttributes` | Remove `type=\"text/javascript\"` from `script` tags. Other `type` attribute values are left intact | `false` |\n| `removeStyleLinkTypeAttributes`| Remove `type=\"text/css\"` from `style` and `link` tags. Other `type` attribute values are left intact | `false` |\n| `removeTagWhitespace` | Remove space between attributes whenever possible. **Note that this will result in invalid HTML!** | `false` |\n| `sortAttributes` | [Sort attributes by frequency](#sorting-attributes--style-classes) | `false` |\n| `sortClassName` | [Sort style classes by frequency](#sorting-attributes--style-classes) | `false` |\n| `trimCustomFragments` | Trim white space around `ignoreCustomFragments`. | `false` |\n| `useShortDoctype` | [Replaces the `doctype` with the short (HTML5) doctype](http://perfectionkills.com/experimenting-with-html-minifier#use_short_doctype) | `false` |\n\n### Sorting attributes / style classes\n\nMinifier options like `sortAttributes` and `sortClassName` won't impact the plain-text size of the output. However, they form long repetitive chains of characters that should improve compression ratio of gzip used in HTTP compression.\n\n## Special cases\n\n### Ignoring chunks of markup\n\nIf you have chunks of markup you would like preserved, you can wrap them ``.\n\n### Minifying JSON-LD\n\nYou can minify script tags with JSON-LD by setting the option `{ processScripts: ['application/ld+json'] }`. Note that this minification is very rudimentary, it is mainly useful for removing newlines and excessive whitespace. \n\n### Preserving SVG tags\n\nSVG tags are automatically recognized, and when they are minified, both case-sensitivity and closing-slashes are preserved, regardless of the minification settings used for the rest of the file.\n\n### Working with invalid markup\n\nHTMLMinifier **can't work with invalid or partial chunks of markup**. This is because it parses markup into a tree structure, then modifies it (removing anything that was specified for removal, ignoring anything that was specified to be ignored, etc.), then it creates a markup out of that tree and returns it.\n\nInput markup (e.g. `foo`)\n\nā\n\nInternal representation of markup in a form of tree (e.g. `{ tag: \"p\", attr: \"id\", children: [\"foo\"] }`)\n\nā\n\nTransformation of internal representation (e.g. removal of `id` attribute)\n\nā\n\nOutput of resulting markup (e.g. `
foo
`)\n\nHTMLMinifier can't know that original markup was only half of the tree; it does its best to try to parse it as a full tree and it loses information about tree being malformed or partial in the beginning. As a result, it can't create a partial/malformed tree at the time of the output.\n\n## Running benchmarks\n\nBenchmarks for minified HTML:\n\n```shell\ncd benchmarks\nnpm install\nnpm run benchmark\n```\n\n## Running local server\n\n```shell\nnpm run serve\n```\n","_attachments":{},"homepage":"https://terser.org/html-minifier-terser/","bugs":{"url":"https://github.com/terser/html-minifier-terser/issues"},"license":"MIT"}