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Your content should always work, no matter what the user agent is, including but certainly not limited to assistive technologies.
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Now, this last guideline,
0:00
the only one that falls under
the robust principle, might seem vague.
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It might seem like common sense or
it might not make any sense at all to you.
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Let's break it down and see if we
can't clarify the final 2.0 guideline.
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Compatible.
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The first success criterion states
in no uncertain terms that you
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must write your HTML correctly,
and completely.
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That's right, to conform with this rule,
all we need to do
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is the web developers version of
crossing our Ts, and dotting our Is.
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Make sure all your HTML tags match up.
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There are no stray
characters lurking around.
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And elements are nested properly.
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The second is honestly quite similar, but
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focuses on the functionality
of each element.
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The function and state of any components
on the webpage like form components or
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video controls must be available to,
and able to be changed by, the user.
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Suppose you have a checkbox
as part of a form.
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It may be tempting to whip up your own
version of the input element to make it
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easier to style according to
the design you're working from.
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But doing so might render that component
unusable by certain visitors to your site,
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if you're not careful.
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In each of these,
note the references to specifications.
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This guideline is telling
us to write our markup
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the way it's supposed to be written.
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Don't take liberties with the language's
syntax because you think it will be faster
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or easier, because that could
lead to negative effects
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on the accessibility of your content.
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Whoa, that was a ton of information
to have crammed into your brain.
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We've covered all 12 guidelines and
their level A success criteria.
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I highly recommend conforming to all
success criteria that are relevant to
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any given project.
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Don't worry about criteria that
don't apply to your content.
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For example,
if you don't have any audio or video,
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you can safely ignore success criteria
that deal with those forms of media.
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There are other standards that
we'll discuss as we go along, but
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we'll lean heavily on 2.0 for guidance as
we learn how to apply techniques to put
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our content in more user's hands.
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