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And welcome back to the second
'Web-developer Fundamentals'.

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Another very important aspect
of being a web developer

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and that is the fact that we
have multiple web browsers.

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Now if you remember Tim Berners-Lee the inventor of
the worldwide web created it because we needed a

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standard way to share documents amongst each other,
and through HTML, CSS and Javascript we're able

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to read these files and actually
have beautiful websites.

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Now, when we send these files over

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Each of these browsers

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read the HTML, CSS, and Javascript,
and layout the web-page for us.

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But as you can see each one of them is owned
by a company, and is a different browser.

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So that means they all have to agree on how they're
going to read the HTML, CSS, and Javascript, because

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if they don't all agree, then well, we need to create
different files specific for each browser, because

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each one of them has a different idea
of what HTML, CSS, and Javascript is.

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And you know what?

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When the World Wide Web got started we had something
called, 'the browser wars' where each browser was

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kind of doing its own thing
implementing different things.

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And we still have that to this day, to some extent,
there is a governing body which kind of creates

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the standards now. But it is still a pain point
for developers, where we need to figure out that

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whenever we send our files to the web browser, it all
looks the same. And that is one of the biggest problems

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we have as developers and you'll see tools later
on in this course that try to solve that issue.

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But you'll always encounter this problem, where we
want to make sure that wherever your browser gets

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rendered, anybody can see your website, and not only
that we also have mobile phones now that access

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the Internet.

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We have iPads.

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So now, not only do we have to worry about different
browsers, and whether they agree on what code works

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in each of these files.

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We also have to make sure that our web sites look
good on small screens on big screens on all sorts

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of different screens, and that is a very important
concept something that, when you get to become a web

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-developer you'll encounter this problem where you
have to test on each device, each browser to make

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sure everything works. And we'll use some tools that
have developed over the years to solve these problems

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so that it's not as much as a pain
point as it is or as it was. All right,

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one more lesson to go and then we're going
to get coding. See you on the other side.