fix: README.md

README.md

@@ -145,7 +145,8 @@ Ferrum::Browser.new(options)
 ```
 
 * options `Hash`
-  * `:headless` (Boolean) - Set browser as headless or not, `true` by default.
+  * `:headless` (String | Boolean) - Set browser as headless or not, `true` by default. You can set `"new"` to support
+      [new headless mode](https://developer.chrome.com/articles/new-headless/).
   * `:xvfb` (Boolean) - Run browser in a virtual framebuffer, `false` by default.
   * `:window_size` (Array) - The dimensions of the browser window in which to
       test, expressed as a 2-element array, e.g. [1024, 768]. Default: [1024, 768]

lib/ferrum/browser/options/chrome.rb

@@ -5,7 +5,7 @@ class Browser
     class Options
       class Chrome < Base
         DEFAULT_OPTIONS = {
-          "headless" => "new",
+          "headless" => nil,
           "disable-gpu" => nil,
           "hide-scrollbars" => nil,
           "mute-audio" => nil,
@@ -76,7 +76,12 @@ def merge_required(flags, options, user_data_dir)
         end
 
         def merge_default(flags, options)
-          defaults = except("headless", "disable-gpu") unless options.headless
+          defaults = case options.headless
+                     when false
+                       except("headless", "disable-gpu")
+                     when "new"
+                       except("headless").merge("headless" => "new")
+                     end
 
           defaults ||= DEFAULT_OPTIONS
           defaults.merge(flags)