autoprefixer/lib/hacks/filter.js

Parse CSS and add vendor prefixes to CSS rules using values from the Can I Use website

let Declaration = require('../declaration')

class Filter extends Declaration {
  /**
   * Check is it Internet Explorer filter
   */
  check(decl) {
    let v = decl.value
    return (
      !v.toLowerCase().includes('alpha(') &&
      !v.includes('DXImageTransform.Microsoft') &&
      !v.includes('data:image/svg+xml')
    )
  }
}

Filter.names = ['filter']

module.exports = Filter