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-# HTMLMinifier
-
-[![NPM version](https://img.shields.io/npm/v/html-minifier-terser.svg)](https://www.npmjs.com/package/html-minifier-terser)
-[![Build Status](https://github.com/terser/html-minifier-terser/workflows/CI/badge.svg)](https://github.com/terser/html-minifier-terser/actions?workflow=CI)
-
-[HTMLMinifier](https://terser.org/html-minifier-terser/) is a highly **configurable**, **well-tested**, JavaScript-based HTML minifier.
-
-## Installation
-
-From NPM for use as a command line app:
-
-```shell
-npm install html-minifier-terser -g
-```
-
-From NPM for programmatic use:
-
-```shell
-npm install html-minifier-terser
-```
-
-## Usage
-
-**Note** that almost all options are disabled by default. Experiment and find what works best for you and your project.
-
-For command line usage please see `html-minifier-terser --help` for a list of available options.
-
-**Sample command line:**
-
-```bash
-html-minifier-terser --collapse-whitespace --remove-comments --minify-js true
-```
-
-### Node.js
-
-```js
-const { minify } = require('html-minifier-terser');
-
-const result = await minify('<p title="blah" id="moo">foo</p>', {
-  removeAttributeQuotes: true,
-});
-result; // '<p title=blah id=moo>foo</p>'
-```
-
-See [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).
-
-Also 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).
-
-For lint-like capabilities take a look at [HTMLLint](https://github.com/kangax/html-lint).
-
-## Minification comparison
-
-How does HTMLMinifier compare to other solutions — [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)?
-
-| Site                                                                         | Original size *(KB)* | HTMLMinifier | minimize | Will Peavy | htmlcompressor.com |
-| ---------------------------------------------------------------------------- |:--------------------:| ------------:| --------:| ----------:| ------------------:|
-| [Google](https://www.google.com/)                                            | 52                   | **48**       | 52       | 54         | n/a                |
-| [Stack Overflow](https://stackoverflow.com/)                                 | 177                  | **143**      | 154      | 154        | n/a                |
-| [HTMLMinifier](https://github.com/kangax/html-minifier)                      | 252                  | **171**      | 230      | 250        | n/a                |
-| [Bootstrap CSS](https://getbootstrap.com/docs/3.3/css/)                      | 271                  | **260**      | 269      | 229        | n/a                |
-| [BBC](https://www.bbc.co.uk/)                                                | 355                  | **324**      | 353      | 344        | n/a                |
-| [Amazon](https://www.amazon.co.uk/)                                          | 466                  | **430**      | 456      | 474        | n/a                |
-| [Twitter](https://twitter.com/)                                              | 469                  | **394**      | 462      | 513        | n/a                |
-| [Wikipedia](https://en.wikipedia.org/wiki/President_of_the_United_States)    | 703                  | **569**      | 682      | 708        | n/a                |
-| [Eloquent Javascript](https://eloquentjavascript.net/1st_edition/print.html) | 870                  | **815**      | 840      | 864        | n/a                |
-| [NBC](https://www.nbc.com/)                                                  | 1701                 | **1566**     | 1689     | 1705       | n/a                |
-| [New York Times](https://www.nytimes.com/)                                   | 1731                 | **1583**     | 1726     | 1680       | n/a                |
-| [ES draft](https://tc39.github.io/ecma262/)                                  | 6296                 | **5538**     | 5733     | n/a        | n/a                |
-
-## Options Quick Reference
-
-Most of the options are disabled by default.
-
-| Option                         | Description     | Default |
-|--------------------------------|-----------------|---------|
-| `caseSensitive`                | Treat attributes in case sensitive manner (useful for custom HTML tags) | `false` |
-| `collapseBooleanAttributes`    | [Omit attribute values from boolean attributes](http://perfectionkills.com/experimenting-with-html-minifier#collapse_boolean_attributes) | `false` |
-| `collapseInlineTagWhitespace`  | Don't leave any spaces between `display:inline;` elements when collapsing. Must be used in conjunction with `collapseWhitespace=true` | `false` |
-| `collapseWhitespace`           | [Collapse white space that contributes to text nodes in a document tree](http://perfectionkills.com/experimenting-with-html-minifier#collapse_whitespace) | `false` |
-| `conservativeCollapse`         | Always collapse to 1 space (never remove it entirely). Must be used in conjunction with `collapseWhitespace=true` | `false` |
-| `continueOnParseError`         | [Handle parse errors](https://html.spec.whatwg.org/multipage/parsing.html#parse-errors) instead of aborting. | `false` |
-| `customAttrAssign`             | Arrays of regex'es that allow to support custom attribute assign expressions (e.g. `'<div flex?="{{mode != cover}}"></div>'`) | `[ ]` |
-| `customAttrCollapse`           | Regex that specifies custom attribute to strip newlines from (e.g. `/ng-class/`) | |
-| `customAttrSurround`           | Arrays of regex'es that allow to support custom attribute surround expressions (e.g. `<input {{#if value}}checked="checked"{{/if}}>`) | `[ ]` |
-| `customEventAttributes`        | Arrays of regex'es that allow to support custom event attributes for `minifyJS` (e.g. `ng-click`) | `[ /^on[a-z]{3,}$/ ]` |
-| `decodeEntities`               | Use direct Unicode characters whenever possible | `false` |
-| `html5`                        | Parse input according to HTML5 specifications | `true` |
-| `ignoreCustomComments`         | Array of regex'es that allow to ignore certain comments, when matched | `[ /^!/, /^\s*#/ ]` |
-| `ignoreCustomFragments`        | Array of regex'es that allow to ignore certain fragments, when matched (e.g. `<?php ... ?>`, `{{ ... }}`, etc.)  | `[ /<%[\s\S]*?%>/, /<\?[\s\S]*?\?>/ ]` |
-| `includeAutoGeneratedTags`     | Insert tags generated by HTML parser | `true` |
-| `keepClosingSlash`             | Keep the trailing slash on singleton elements | `false` |
-| `maxLineLength`                | Specify a maximum line length. Compressed output will be split by newlines at valid HTML split-points |
-| `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)`) |
-| `minifyJS`                     | Minify JavaScript in script elements and event attributes (uses [Terser](https://github.com/terser/terser)) | `false` (could be `true`, `Object`, `Function(text, inline)`) |
-| `minifyURLs`                   | Minify URLs in various attributes (uses [relateurl](https://github.com/stevenvachon/relateurl)) | `false` (could be `String`, `Object`, `Function(text)`) |
-| `noNewlinesBeforeTagClose`     | Never add a newline before a tag that closes an element | `false` |
-| `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` |
-| `preventAttributesEscaping`    | Prevents the escaping of the values of attributes | `false` |
-| `processConditionalComments`   | Process contents of conditional comments through minifier | `false` |
-| `processScripts`               | Array of strings corresponding to types of script elements to process through minifier (e.g. `text/ng-template`, `text/x-handlebars-template`, etc.) | `[ ]` |
-| `quoteCharacter`               | Type of quote to use for attribute values (' or ") | |
-| `removeAttributeQuotes`        | [Remove quotes around attributes when possible](http://perfectionkills.com/experimenting-with-html-minifier#remove_attribute_quotes) | `false` |
-| `removeComments`               | [Strip HTML comments](http://perfectionkills.com/experimenting-with-html-minifier#remove_comments) | `false` |
-| `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)`) |
-| `removeEmptyElements`          | [Remove all elements with empty contents](http://perfectionkills.com/experimenting-with-html-minifier#remove_empty_elements) | `false` |
-| `removeOptionalTags`           | [Remove optional tags](http://perfectionkills.com/experimenting-with-html-minifier#remove_optional_tags) | `false` |
-| `removeRedundantAttributes`    | [Remove attributes when value matches default.](http://perfectionkills.com/experimenting-with-html-minifier#remove_redundant_attributes) | `false` |
-| `removeScriptTypeAttributes`   | Remove `type="text/javascript"` from `script` tags. Other `type` attribute values are left intact | `false` |
-| `removeStyleLinkTypeAttributes`| Remove `type="text/css"` from `style` and `link` tags. Other `type` attribute values are left intact | `false` |
-| `removeTagWhitespace`          | Remove space between attributes whenever possible. **Note that this will result in invalid HTML!** | `false` |
-| `sortAttributes`               | [Sort attributes by frequency](#sorting-attributes--style-classes) | `false` |
-| `sortClassName`                | [Sort style classes by frequency](#sorting-attributes--style-classes) | `false` |
-| `trimCustomFragments`          | Trim white space around `ignoreCustomFragments`. | `false` |
-| `useShortDoctype`              | [Replaces the `doctype` with the short (HTML5) doctype](http://perfectionkills.com/experimenting-with-html-minifier#use_short_doctype) | `false` |
-
-### Sorting attributes / style classes
-
-Minifier 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.
-
-## Special cases
-
-### Ignoring chunks of markup
-
-If you have chunks of markup you would like preserved, you can wrap them `<!-- htmlmin:ignore -->`.
-
-### Minifying JSON-LD
-
-You 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. 
-
-### Preserving SVG tags
-
-SVG 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.
-
-### Working with invalid markup
-
-HTMLMinifier **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.
-
-Input markup (e.g. `<p id="">foo`)
-
-↓
-
-Internal representation of markup in a form of tree (e.g. `{ tag: "p", attr: "id", children: ["foo"] }`)
-
-↓
-
-Transformation of internal representation (e.g. removal of `id` attribute)
-
-↓
-
-Output of resulting markup (e.g. `<p>foo</p>`)
-
-HTMLMinifier 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.
-
-## Running benchmarks
-
-Benchmarks for minified HTML:
-
-```shell
-cd benchmarks
-npm install
-npm run benchmark
-```
-
-## Running local server
-
-```shell
-npm run serve
-```