terser / html-minifier-terser

actively maintained fork of html-minifier - minify HTML, CSS and JS code using terser - supports ES6 code

HTMLMinifier

HTMLMinifier is a highly configurable, well-tested, JavaScript-based HTML minifier.

Installation

From NPM for use as a command line app:

npm install html-minifier-terser -g

From NPM for programmatic use:

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:

html-minifier-terser --collapse-whitespace --remove-comments --minify-js true

Node.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 for all the gory details of how it works, description of each option, testing results and conclusions.

Also see corresponding Ruby wrapper, and for Node.js, Grunt plugin, Gulp plugin, Koa middleware wrapper and Express middleware wrapper.

For lint-like capabilities take a look at HTMLLint.

Minification comparison

How does HTMLMinifier compare to other solutions — HTML Minifier from Will Peavy (1st result in Google search for "html minifier") as well as htmlcompressor.com and minimize?

Site	Original size (KB)	HTMLMinifier	minimize	Will Peavy	htmlcompressor.com
Google	52	48	52	54	n/a
Stack Overflow	177	143	154	154	n/a
HTMLMinifier	252	171	230	250	n/a
Bootstrap CSS	271	260	269	229	n/a
BBC	355	324	353	344	n/a
Amazon	466	430	456	474	n/a
Twitter	469	394	462	513	n/a
Wikipedia	703	569	682	708	n/a
Eloquent Javascript	870	815	840	864	n/a
NBC	1701	1566	1689	1705	n/a
New York Times	1731	1583	1726	1680	n/a
ES draft	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	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	false
conservativeCollapse	Always collapse to 1 space (never remove it entirely). Must be used in conjunction with collapseWhitespace=true	false
continueOnParseError	Handle 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)	false (could be true, Object, Function(text, type))
minifyJS	Minify JavaScript in script elements and event attributes (uses Terser)	false (could be true, Object, Function(text, inline))
minifyURLs	Minify URLs in various attributes (uses 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	false
removeComments	Strip HTML comments	false
removeEmptyAttributes	Remove all attributes with whitespace-only values	false (could be true, Function(attrName, tag))
removeEmptyElements	Remove all elements with empty contents	false
removeOptionalTags	Remove optional tags	false
removeRedundantAttributes	Remove attributes when value matches default.	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	false
sortClassName	Sort style classes by frequency	false
trimCustomFragments	Trim white space around ignoreCustomFragments.	false
useShortDoctype	Replaces the doctype with the short (HTML5) 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:

cd benchmarks
npm install
npm run benchmark

Running local server

npm run serve

html-minifier-terser's Issues

`"//` was incorrectly converted to `"/`

Environment

• html-minifier-terser version: 5.1.1
• node.js version - node -v: v10.23.0
• operating system: macos 10.15.7

Input

const { minify } = require('html-minifier-terser');
const output = minify(`
<div style="background-image:url(&quot;//www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png&quot;)"></div>
`, {
  minifyCSS: true,
});
console.log(output)

Actual output

<div style="background-image:url(&quot;/www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png&quot;)"></div>

Expected output

<div style="background-image:url(&quot;//www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png&quot;)"></div>

After opening minifyCSS, "// will be converted into "/. Eventually cause the picture to fail

how to keep invalid css as is

For example we have the code and set the minifyCSS option to true:

<div style="invalid css here">test</div>

Output:

<div style="">Foo</div>

Will be great keep invalid css as is and do not remove him.

ref: webpack-contrib/html-loader#213

[FEATURE] `collapseBooleanAttributes` doesn't work with custom attributes

const minify = require("html-minifier-terser").minify;

console.log(
  minify(
    '<a href="#" router="true" another="another" variant=variant test=true>Test</a>',
    {
      collapseBooleanAttributes: true
    }
  )
);

result

<a href="#" router="true" another="another" variant="variant" test="true">Test</a>

expected result

<a href="#" router another variant test>Test</a>

Are my expectations incorrect?

Missing dependency in 6.0.0 version

Version

• Yarn: [email protected]
• html-minifier-terser: 6.0.0
• webpack: 5.41.1

Webpack log:

ERROR in ./.yarn/cache/terser-npm-5.7.2-c24448e930-143029e7f7.zip/node_modules/terser/dist/bundle.min.js 27467:31-53
Module not found: Error: Can't resolve 'acorn' in '/mnt/data/Repositorios/portfolio/.yarn/cache/terser-npm-5.7.2-c24448e930-143029e7f7.zip/node_modules/terser/dist'
resolve 'acorn' in '/mnt/data/Repositorios/portfolio/.yarn/cache/terser-npm-5.7.2-c24448e930-143029e7f7.zip/node_modules/terser/dist'
  Parsed request is a module
  using description file: /mnt/data/Repositorios/portfolio/.yarn/cache/terser-npm-5.7.2-c24448e930-143029e7f7.zip/node_modules/terser/dist/package.json (relative path: .)
    resolve as module
      request is not managed by the pnpapi
        terser tried to access acorn, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.
        Required package: acorn
        Required by: terser@npm:5.7.2 (via /mnt/data/Repositorios/portfolio/.yarn/cache/terser-npm-5.7.2-c24448e930-143029e7f7.zip/node_modules/terser/dist/)

Command yarn info html-minifier-terser:

└─ html-minifier-terser@npm:6.0.0
   ├─ Version: 6.0.0
   │
   ├─ Exported Binaries
   │  └─ html-minifier-terser
   │
   └─ Dependencies
      ├─ camel-case@npm:^4.1.2 → npm:4.1.2
      ├─ clean-css@npm:^5.1.3 → npm:5.1.5
      ├─ commander@npm:^7.2.0 → npm:7.2.0
      ├─ he@npm:^1.2.0 → npm:1.2.0
      ├─ param-case@npm:^3.0.4 → npm:3.0.4
      ├─ relateurl@npm:^0.2.7 → npm:0.2.7
      └─ terser@npm:^5.7.1 → npm:5.7.2

Returning to version 5.1.1 the issue is fixed

options

could you add options of js/css minifier for test page(https://danielruf.github.io/html-minifier-terser)

[Documentation] Difference between html-minifier-terser and original html-minifier

It's not very clear what is the difference between this project and original html-minifier.
Adding some motivations and explanations to the readme will help understand and do the switch.

Snyk

Add Snyk

Messes with cases when it shouldn't

If you have some liquid statements like

{% if fooBar %} baz {% endif %}

For some reason it outputs foobar, removing the capital letter, even with the option caseSensitive: true.

A quick workaround is to add the rule:

ignoreCustomFragments: [
  /(?<={%)(.*?)(?=%})/, // {% this %} 
]

But it's not ideal of course, and the bug seemed a little unexpected.

PS: Love the plugin, fantastically useful!

Trying to get in touch regarding a security issue

Hey there!

I'd like to report a security issue but cannot find contact instructions on your repository.

If not a hassle, might you kindly add a SECURITY.md file with an email, or another contact method? GitHub recommends this best practice to ensure security issues are responsibly disclosed, and it would serve as a simple instruction for security researchers in the future.

Thank you for your consideration, and I look forward to hearing from you!

(cc @huntr-helper)

Test CLI

93ac5b3 and 03bc8d1 broke the require statement as they are different now. This was fixed in 9f2d234

But this was just found while manually testing with the CLI. So we should also test the CLI.

Migrate to cli-table3

customAttrCollapse doesn't respect conservativeCollapse

In our angular.js based app we have attributes with long expressions which we sometimes spread over multiple lines like this:

repeat="role in modal.roles |
        filter: {displayName: $select.search}
        track by role.id"

Earlier we used minimize to minify HTML and that stuff would be collapsed correctly into:

repeat="role in modal.roles | filter: {displayName: $select.search} track by role.id"

Now after switching to webpack + html-loader we noticed that such attributes are not processed at all by default. customAttrCollapse + conservativeCollapse looked like exactly what we need, however it turned out that they don't work together. Is there a way to work around that?

When we will have new version?

As everyone knows there are several merged PRs after 14th May 2020, so when do we have the new version?

Why not provide a specific property to clear the html source tag？

please provide a property to clear the html tag，such as 'removeTags' ,we can use this property to remove some tag content that we do not need In the compiled html file

Bump engines.node to >= 10

Invalid arg type error with --input-dir / --output-dir options

html-minifier-terser version: 6.0.1
OS: Ubuntu 21.04

On node 14.0.0 and above if I use the following command:

npx --package [email protected] -- html-minifier-terser --file-ext html --input-dir src --output-dir dist

I get:

internal/fs/utils.js:656
    throw new ERR_INVALID_ARG_TYPE(
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Promise
    at Object.writeFile (fs.js:1356:5)
    at /home/laurent/projects/myproject/node_modules/html-minifier-terser/cli.js:245:8
    at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:63:3) {
  code: 'ERR_INVALID_ARG_TYPE'
}

On node 13.14.0 the following command generates no error:

npx --package [email protected] -- html-minifier-terser --file-ext html --input-dir src --output-dir dist

but the content of the minified html file is:

 [object Promise]

Everything was working fine with html-minifier-terser v5.1.1

Allow async functions for minifyCSS and minifyJS

Right now we can't use async functions for minifyCSS and minifyJS.

next release planning

typings

maybe we could merge https://www.npmjs.com/package/@types/html-minifier into this package?

after set "conservativeCollapse: false", still leave a white space between html elements

Expected behaviour

with "conservativeCollapse: false", it should remove white spaces between html elements entirely.

<div><a href="#">123</a><a href="#">456</a><a href="#">test 3</a></div>

Current behaviour

Still leave a white space between html elements.

<div><a href="#">123</a> <a href="#">456</a> <a href="#">test 3</a></div>

Environment

Node.js v12.14.0
linux 5.0.0-37-generic
npm 6.13.4
[email protected]
[email protected]

Config

  plugins: [
    new HtmlWebpackPlugin({
      chunks: ['index'],
      template: './src/index.html',
      filename: './index.html',
      minify: { removeComments: true, removeEmptyAttributes: true, removeRedundantAttributes: false, collapseWhitespace: true, conservativeCollapse: false }
    }),
    new HtmlWebpackPlugin({
      chunks: ['sub'],
      template: './src/sub.html',
      filename: './sub.html',
      minify: { removeComments: true, removeEmptyAttributes: true, removeRedundantAttributes: false, collapseWhitespace: true, conservativeCollapse: false }
    })
  ],

Copy your template file if it is part of this issue:

<!DOCTYPE html>
<html>
    <head>
        <title>My App</title>
    </head>
    <body>
                <div>
                        <a href="#">123</a>
                        <a href="#">456</a>
                        <a href="#">test 3</a>
                </div>
    </body>
</html>

Relevant Links

Additional context

Adjust readme and examples

They still use the old name.

Compress script data block

For google datasets to work it requires Schema.org JSON-LD inline script tag on a page. Compression of this by default or behind a flag would be awesome.

Example

<script type="application/ld+json">
{
        "@context": {
            "@vocab":"https://schema.org/"
        },
        "@type": "Dataset"
}
</script>

Setup dependabot

Migrate to GitHub Actions

no CHANGELOG and release notes

It's pretty hard to understand what has changed and fixed, will be great to have CHANGELOG or release notes on each version in future

Consider rename the project? The name is too **** loooooooooooong!

Migrate from uglify-js to terser

Update all dependencies

Escape special chars

Hi @DanielRuf

Try it out https://danielruf.github.io/html-minifier-terser/

<h2><a aria-hidden="true" tabindex="-1" class="anchor" id="initial-setup--8"></a><a aria-hidden="true" tabindex="-1" class="hash-link" href="#initial-setup--8" title="Direct link to heading">#</a><div>Initial setup < 8</div></h2>

Output:

Error: Parse Error: < 8

How to avoid this? Is it possible to escape special characters?

Fix array length check

var length = array.length < 0 ? 0 : checked(array.length) | 0

That makes not much sense as it can never be smaller than 0.

[FEATURE]: Add new CLI argument to add extra content to the output file

It would be good, to have a new CLI argument to add extra stuff to the output file automatically. My NetBeans plugin has a JEditorPane and when I add stuff there, every file that is will be minifed needs to have this content automatically added to the outpuf file. Yes, I can add this in another way like after the output file was created, I can add this, but I think it would be better to have such a cli argument. What do you think?

Update CI config

osis not set and it seems matrix is deprecated and jobs is used now.

https://travis-ci.com/DanielRuf/html-minifier-terser/builds/148107746/config#rccb_html-minifier-terser:[email protected]

travis-ci/docs-travis-ci-com#1500

terser option mangle fails on / breaks document with several scripts

When enabling JavaScript mangling in terser (e.g. --minify-js {"compress":{"drop_console":"true"},"mangle":{"toplevel":"true"}} my page breaks (TypeError: e is not a function).

Test case:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>title</title>
    <script>
        function functiona(param1) {
            return functionb(param1);
        }
    </script>
</head>
<body>
    Some text in body.
    <div id="target">target</div>
    <script>
        function functionb(param2) {
          return param2;
        }
        document.addEventListener("OnDOMContentLoaded", function(){
            console.log("loaded");
            var test = functiona(undefined);
        });
    </script>
</body>
</html>

turns into

<!doctype html>
<html lang=en>
<meta charset=UTF-8>
<meta name=viewport content="width=device-width,initial-scale=1">
<title>title</title>
<script>
    function n(n) {
        return functionb(n)
    }
</script>Some text in body.<div id=target>target</div>
<script>
    function n(n) {
        return n
    }
    document.addEventListener("OnDOMContentLoaded", (function () {
        functiona(void 0)
    }))
</script>

It seems html-minifier-terser minifies these individually, rather than in the same "namespace" - correct? This of course also would explain the TypeError I am seeing with my actual HTML page.

Is there an option to prevent this? If not, and this is not in the scope of the project, is there a workaround?

---

For reference

• https://github.com/DanielRuf/html-minifier-terser/blob/master/src/htmlminifier.js#L702
• https://terser.org/docs/api-reference

Invalid Arg Type Error on minify

I installed version 6.0.0 from html-minifier-terser. In the CLI I tried -> html-minifier-terser index.html --output index.min.html and I got this error:

C:\temp>html-minifier-terser index.html --output index.min.html
internal/streams/writable.js:285
      throw new ERR_INVALID_ARG_TYPE(
      ^

TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer or Uint8Array. Received an instance of Promise
←[90m    at WriteStream.Writable.write (internal/streams/writable.js:285:13)←[39m
    at writeMinify (C:\Users\Chris\AppData\Roaming\npm\node_modules\←[4mhtml-minifier-terser←[24m\cli.js:288:24)
    at Object.<anonymous> (C:\Users\Chris\AppData\Roaming\npm\node_modules\←[4mhtml-minifier-terser←[24m\cli.js:305:3)
←[90m    at Module._compile (internal/modules/cjs/loader.js:1063:30)←[39m
←[90m    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)←[39m
←[90m    at Module.load (internal/modules/cjs/loader.js:928:32)←[39m
←[90m    at Function.Module._load (internal/modules/cjs/loader.js:769:14)←[39m
←[90m    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)←[39m
←[90m    at internal/main/run_main_module.js:17:47←[39m {
  code: ←[32m'ERR_INVALID_ARG_TYPE'←[39m
}

Did I miss smth or did the syntax for the CLI changed?

Windows 10 (64bit)
Node: 14.16.0
NPM: 7.5.2

html-webpack-plugin dependency has node version mismatch

webpack 4 supports node 6.x

therefore html-webpack-plugin tries to do the same.

html-minifier also supports node 6.x https://github.com/kangax/html-minifier/blob/51ce10f4daedb1de483ffbcccecc41be1c873da2/package.json#L50

also terser supports node 6.x
https://github.com/terser/terser/blob/6589965fe372124ce94410c9e0e7389732a3c8ea/package.json#L9

unfortunately html-minfier-terser is not compatible to the webpack 4 eco system:
https://github.com/DanielRuf/html-minifier-terser/blob/47cbb36f294dd49e20779213be721238a80f6c47/package.json#L52

is there any way to support node 6.x?

See also jantimon/html-webpack-plugin#1313

New maintainer wanted

html-minifier-terser is looking for a new longterm maintainer.

Maybe this is something for you or the webpack team @alexander-akait @sibiraj-s.

Implement a synchronous `minify` method in v6+

Hi @DanielRuf,

Is there a possibility to implement/bring back a minify() method for doing minification stuff synchronously?
In my case, I have a webpack setup that uses html-minifier-terser inside a plugin that call his own hooks synchronously... that's why I am unable to call it asynchronously. I don't want to be "stucked" in the future in version 5+.

I really understand the point of implementing async/await, but it makes the plugin impossible to use in some cases.

Working with [email protected], [email protected] and [email protected] at this moment of writing.

New release has a weird bug!

Hello again, Based on this issue I send this PR for updating Clean-CSS, and when this package was released on version 6+, I updated this package on my project, but after bundle I just see {} for rendered HTML on browser.

We downgrade to 5.1.1 and everything is ok now.

I considered it my duty to report it. if need any more data please tell me. I will share to prevent this weird bug.

minifier removes script-type-module attribute. it should not.

hi,
test case:

input (test.html):

<script type="module">console.log('hello')</script>

command:

./node_modules/.bin/html-minifier-terser --remove-script-type-attributes test.html

output:

<script>console.log('hello')</script>

as you see, the type="module" part got removed. it should not be removed, because when a script tag has type-module, it's content will be executed differently. also, the documentation for the flag says:
"
--remove-script-type-attributes Remove type="text/javascript" from script tags. Other type attribute values are left intact.
"
which is not correct with the behavior.

Unexpected behavior when minifying HTML containing SVG

Given the following SVG (derived from this HTML document)

<svg xmlns:xlink="http://www.w3.org/1999/xlink" width="23.947ex" height="6.343ex" style="vertical-align: -2.838ex;" viewBox="0 -1508.9 10310.5 2730.8" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" aria-labelledby="MathJax-SVG-1-Title">
<title id="MathJax-SVG-1-Title">e r f left-parenthesis x right-parenthesis equals StartFraction 2 Over StartRoot pi EndRoot EndFraction integral Subscript 0 Superscript x Baseline e Superscript minus t squared Baseline normal d t</title>
<defs aria-hidden="true">
<path stroke-width="1" id="E1-MJMAIN-65" d="M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z"></path>
<path stroke-width="1" id="E1-MJMAIN-72" d="M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z"></path>
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the minifier generates the following (derived from this HTML document)

<svg xmlns:xlink="http://www.w3.org/1999/xlink" width="23.947ex" height="6.343ex" style="vertical-align:-2.838ex" viewBox="0 -1508.9 10310.5 2730.8" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" aria-labelledby="MathJax-SVG-1-Title"><title id="MathJax-SVG-1-Title">e r f left-parenthesis x right-parenthesis equals StartFraction 2 Over StartRoot pi EndRoot EndFraction integral Subscript 0 Superscript x Baseline e Superscript minus t squared Baseline normal d t</title><defs aria-hidden="true"></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)" aria-hidden="true"><g transform="translate(3551,0)"><g transform="translate(397,0)"><g transform="translate(60,-797)"></g></g></g><g transform="translate(5762,0)"></g><g transform="translate(7495,0)"><g transform="translate(466,412)"><g transform="translate(550,0)"></g></g></g></g></svg>

As can be observed in the output, all the <path>, <rect>, and <use> elements have been removed from the original SVG, which is not desirable.

The output was generated via the following command:

html-minifier-terser --remove-comments --collapse-whitespace --remove-empty-elements --minify-css true --minify-js true

This is potentially due to the use of non-self-closing tags and --remove-empty-elements?

If so, this may not be desirable for SVG, where "empty" elements are fairly commonplace and valid. If the minifier is unable to modify its behavior, may be worth noting in the package README that, if HTML includes SVG, may not want to use --remove-empty-elements.

Replace phantomjs-prebuilt

See kangax/html-minifier#1044

update terser to latest version (5)

Will be great to do it ASAP to avoid multiple dependencies, thanks for work on the package, plus update old deps too 😄 If you need I can help at the end of week

Strange behaviour in conversion of link tag attribute onload="this.media='all'"

I have below tag in my html file:

<link rel="stylesheet" href="styles.56ec616e3d29e712c590.css" media="print" onload="this.media='all'">

When I run html-minifier-terser -o dist/index.html dist/index.html --remove-comments --collapse-whitespace --minify-js --minify-css

I generates:

<link rel="stylesheet" href="styles.56ec616e3d29e712c590.css" media="print" onload='this.media="all"'>

i.e. surrounds onload in single quote.

I want to keep this tag as it is therefore I tried

--quote-character "

But with this option it generates:

<link rel="stylesheet" href="styles.56ec616e3d29e712c590.css" media="print" onload="this.media=&#34;all&#34;">

Can anyone please help?

Minifying issue with CSS

Unfortunately, html-minifier-terser during minifying with the minifyCSS: true, we faced this issue. my code is like this:

div * {
  color: red;
}

Bu my code is changed to this:

div*{color:red}

And browser cannot understand this selector div* it should be div *, even in the production level after minifying, is there any property for preventing that issue or is it a bug?

Migrate to Jest

Update benchmark results

check open PRs

We should check the PRs at https://github.com/kangax/html-minifier/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc and see if we have to merge some to fix a few issues.

How to import into ES6 Module in the Browser?

Hello,
How can I access or import "html-minifier-terser" into my ES6 module so I can use it? This is running in the browser and I am not using a build tool like webpack etc.

Move to some org?

Migrate to csso (has blocker)

Blocker: #27 (comment)