<a href="#" name="q" onclick="a">Click Me</a>

require "selenium-webdriver"
driver = Selenium::WebDriver.for :chrome
driver.navigate.to ARGV[0]
driver.find_element(:name, 'q').click
p driver.manage.logs.get(:browser)

$ ruby chrome.rb file:///path/to/file
[#<Selenium::WebDriver::LogEntry:0x007fdbaaa52570 @level="SEVERE", @timestamp=1474367536635, @message="file:///path/to/file 1:34 Uncaught ReferenceError: a is not defined">]

driver.manage.logs.get(:driver)

driver.manage.logs.get(:browser)

require "selenium-webdriver"
driver = Selenium::WebDriver.for :chrome
driver.navigate.to ARGV[0]
driver.find_element(:name, 'q').click
p driver.manage.logs.get(:driver)

$ ruby chrome.rb file:///path/to/file
[#<Selenium::WebDriver::LogEntry:0x007fdd438ebcc8
  @level="INFO",
  @message='
Populating Preferences file: {
   "alternate_error_pages": {
      "enabled": false
   },
   "autofill": {
      "enabled": false
   },
   "browser": {
      "check_default_browser": false
   },
   "distribution": {
      "import_bookmarks": false,
      "import_history": false,
      "import_search_engine": false,
      "make_chrome_default_for_user": false,
      "show_welcome_page": false,
      "skip_first_run_ui": true
   },
   "dns_prefetching": {
      "enabled": false
   },
   "profile": {
      "content_settings": {
         "pattern_pairs": {
            "https://*,*": {
               "media-stream": {
                  "audio": "Default",
                  "video": "Default"
               }
            }
         }
      },
      "default_content_setting_values": {
         "geolocation": 1
      },
      "default_content_settings": {
         "geolocation": 1,
         "mouselock": 1,
         "notifications": 1,
         "popups": 1,
         "ppapi-broker": 1
      },
      "password_manager_enabled": false
   },
   "safebrowsing": {
      "enabled": false
   },
   "search": {
      "suggest_enabled": false
   },
   "translate": {
      "enabled": false
   }
}',
  @timestamp=1474477725283>,

...

 #<Selenium::WebDriver::LogEntry:0x007fdd438f9170
  @level="DEBUG",
  @message='
DEVTOOLS RESPONSE Runtime.evaluate (id=22) {
   "result": {
      "description": "1",
      "type": "number",
      "value": 1
   },
   "wasThrown": false
}',
  @timestamp=1474477756252>]