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JavaScript JavaScript Basics (Retired) Introducing JavaScript Using the Console

Why errors in javascript course

Why are there so many errors on the page itself: Empty string passed to getElementById(). vendor-29d7521dcd9c39592ffad29d2f25e50a.js:137:0 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. vendor-29d7521dcd9c39592ffad29d2f25e50a.js:15:0 Empty string passed to getElementById(). vendor-29d7521dcd9c39592ffad29d2f25e50a.js:137:0 This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.[Learn More] tr TypeError: window.document.getElementById(...) is null cb=gapi.loaded_0:130:226 window.controllers is deprecated. Do not use it for UA detection. nsHeaderInfo.js:412:0 This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.[Learn More] ping Given URL is not allowed by the Application configuration: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains. ping:1:51 window.controllers is deprecated. Do not use it for UA detection. nsHeaderInfo.js:412:0 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://ps4.pubnub.com/subscribe/sub-e2de2b5c-13c2-11e2-b508-f53fda4cd93d/836e1955-4500-4f81-9178-f194aa25751e%2Cth-production-b5c32d074e6880710b4a104377efac9c/0/0?uuid=906c9c7c-5c7c-42be-9389-6ca8ad2ad76c&pnsdk=PubNub-JS-Web%2F3.6.7. (Reason: CORS request failed). <unknown> window.controllers is deprecated. Do not use it for UA detection.

It is usually best to not post the whole error when asking this type of question. It probably isn't a big deal, and has something to do with the page that you launched the console on. Just type clear() into the console and start from there.