Let's talk about with WCAG Principle 3, Understandable. 0:00 The first step to making our web content understandable is making it readable. 0:04 At its most basic level, 0:10 this means making the default language of our content identifiable. 0:11 This is a low hanging fruit. 0:16 We can accomplish it by including the lang attribute in our HTML element. 0:18 A predictable web page doesn't do things that the user hasn't asked it to do. 0:23 Changing focus or 0:27 the settings of the UI component shouldn't trigger a change of context. 0:29 What's a change of context you ask? 0:34 This is a great time to point out that the WCAG working group is pretty self-aware. 0:36 They know they've used terms that might not be familiar or 0:41 make sense to regular people in this context. 0:45 Knowing that, they've created a glossary. 0:49 You can click on many of the terms you'll find throughout the guidelines to see 0:51 an explanation. 0:55 In this case, we'll click on change of context. 0:56 This is great because not only does it expand on the term itself, 1:01 but it gives us an example. 1:06 So now we now that success criteria 3.2.1 and 1:08 3.2.2 are saying we should never trigger things like pop-up windows or 1:14 switch to a different page just because an element has received focus or 1:21 UI settings have changed. 1:25 Taking the time to discover the meaning of terms you don't understand will make it 1:27 much easier to gauge the excessive ability of your work in a long run. 1:32 The last guideline governed by the understandable principle has to do with 1:36 input elements. 1:41 Whatever the user needs to do to fill out our forms should be crystal clear. 1:43 Provide sufficient instructions and label all of your input elements. 1:48 Any error we detect should be communicated to the user so that they can fix it. 1:54 Have you ever filled out a form and had your input rejected but 2:00 couldn't tell what was wrong? 2:03 This kind of issue could keep a new user from signing up for your service, or 2:05 a customer from buying your product. 2:10