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
[ /^!/ ]
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 UglifyJS)
false (could be true, Object, Function(text, inline))
minifyURLs
Minify URLs in various attributes (uses relateurl)
false (could be String, Object, Function(text))
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 ")
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 -->.
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.
Installation Instructions
From NPM for use as a command line app:
npm install html-minifier -g
From NPM for programmatic use:
npm install html-minifier
From Git:
git clone git://github.com/kangax/html-minifier.git
cd html-minifier
npm link .
Usage
Note that almost all options are disabled by default. For command line usage please see html-minifier --help for a list of available options. Experiment and find what works best for you and your project.
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