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inject-stylesheet

This library takes a blocklist (or allowlist) of CSS properties and sanitizes for known CSS exploits.

API

Where mentioned, styles is an object with its keys being CSS selectors and values being CSS property key-value pairs.

var stylesheet = injectStylesheet.injectWithBlocklist(styles [, blocklist]);
var stylesheet = injectStylesheet.injectWithAllowlist(styles [, allowlist]);

After usage, stylesheet will refer to the <style> tag that was injected into the <head> of the document.

var injectStylesheet = require("inject-stylesheet");
var styles = {
  input: {
    "font-size": "16pt",
    color: "#3A3A3A",
  },
  ".invalid": {
    color: "tomato",
  },
  "@media screen and (max-width: 700px)": {
    input: {
      "font-size": "14pt",
    },
  },
};
var allowlist = ["font-size", "color"];
var blocklist = ["background", "display"];

injectStylesheet.injectWithBlocklist(styles, blocklist);
injectStylesheet.injectWithAllowlist(styles, allowlist);

Sanitization

Selectors

Selectors are filtered for things such as {}, @import, etc.

Keys

Keys are filtered based on whether or not a blocklist or allowlist was given. injectStylesheet will assume that its second parameter is a blocklist unless the third parameter is true, which will designate it as a allowlist. This listing is used to filter the given CSS properties for exclusion or inclusion.

Values

Values are checked against usages of url(), evaluate(), and other potentially abused and powerful CSS functions.

Browser Support

All modern browsers, and IE9+

About

Create a <style> element with CSS properties, filtering input using a whitelist or blacklist

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