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PostCSS HTML Syntax

PostCSS syntax for parsing HTML (and HTML-like)

Getting Started

First thing's first, install the module:

npm install postcss-html --save-dev

If you want support SCSS/SASS/LESS/SugarSS syntax, you need to install the corresponding module.

SCSS: postcss-scss
SASS: postcss-sass
LESS: postcss-less
SugarSS: sugarss
Stylus: postcss-styl

Use Cases

const postcss = require('postcss');
const syntax = require('postcss-html')({
    // syntax for parse scss (non-required options)
    scss: require('postcss-scss'),
    // syntax for parse less (non-required options)
    less: require('postcss-less'),
    // syntax for parse css blocks (non-required options)
    css: require('postcss-safe-parser'),
});
postcss(plugins).process(source, { syntax: syntax }).then(function (result) {
    // An alias for the result.css property. Use it with syntaxes that generate non-CSS output.
    result.content
});

If you want support SCSS/SASS/LESS/SugarSS syntax, you need to install these module:

SCSS: postcss-scss
SASS: postcss-sass
LESS: postcss-less
SugarSS: sugarss
Stylus: postcss-styl

Advanced Use Cases

Options

const options = {
    rules: [
        {
            // custom language
            test: /^postcss$/i,
            lang: 'scss'
        },
        {
            // custom language
            test: /^customcss$/i,
            lang: 'custom'
        },
    ],

    // custom parser for CSS (using `postcss-safe-parser`)
    css: 'postcss-safe-parser',
    // custom parser for SASS (PostCSS-compatible syntax.)
    sass: require('postcss-sass'),
    // custom parser for SCSS (by module name)
    scss: 'postcss-scss',
    // custom parser for LESS (by module path)
    less: require.resolve('./node_modules/postcss-less'),
    // custom parser for SugarSS
    sugarss: require('sugarss'),
    // custom parser for custom language
    custom: require('postcss-custom-syntax'),
}
const syntax = require('postcss-html')(options);

Turning PostCSS off from within your HTML

PostCSS can be temporarily turned off by using special comments in your HTML. For example:

<html>
<body>
<!-- postcss-ignore -->
<a style="color: red;" description="style is not parsed."></a>

<a style="color: red;" description="style is parsed."></a>

<html>
<body>
<!-- postcss-disable -->
<a style="color: red;" description="style is not parsed."></a>
<a style="color: red;" description="style is not parsed."></a>
<!-- postcss-enable -->

<a style="color: red;" description="style is parsed."></a>

Linting with Stylelint

The main use case of this plugin is to apply linting with Stylelint to <style> tags and <div style="*"> property in HTML (and HTML-like).

You can use it by configuring your stylelint config as follows:

{
    "overrides": [
        {
            "files": ["*.html", "**/*.html"],
            "customSyntax": "postcss-html"
        }
    ]
}

You can use it more easily if you use an already configured sharable config.

{
+    "extends": [
+        "stylelint-config-html",
         // If you are using Vue.
+        "stylelint-config-recommended-vue"
+    ],
-    "overrides": [
-        {
-            "files": ["*.html", "**/*.html"],
-            "customSyntax": "postcss-html"
-        }
-    ]
}

README.md