Package Exports

inject-stylesheet
inject-stylesheet/dist/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (inject-stylesheet) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

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+