Certainly, I'll do my best!  Unfortunately, as a language model that has not been trained on any canine language corpus, I cannot explain HTML in any way a dog could *actually* understand.

However, if I were able to, it would probably be a series of barks and woofs and body language that imparts the following:

> Have you ever wondered how humans talk about new yummy treats or squeak toys you enjoy, and then those treats somehow just show up at the door in a box?  Or how a human can look at a phone (those things they carry everywhere and tap on and that that make loud sounds sometimes) to find a new dog park you've never been to before?  It all starts with HTML, which is one of many ways for humans and computers to talk to each other about how to show the words, images, and other stuff on the objects they use, such as a phone, tablet or computer (those larger things they tap on sometimes).
> 
> It's a bit like how a dog might understand certain commands, like "sit" or "stay." Just as a dog can understand and follow certain commands, computers can understand and follow certain HTML commands to show useful pictures and words. For example, an HTML command might tell a computer to show a picture of a bone, or to make some words look louder to humans by making them bigger, or to show a moving picture, like those ones of other dogs you like to bark at. 
> 
> Other humans have taught objects like phones and tablets and computers to all know HTML commands, sort of like how you and your friends may have been trained to "sit" or "rollover", but using different methods. The phones and tablets and computers follow these HTML commands to show words and pictures and other things, so that you and your human don't have to know the HTML commands or a lot of other computer commands, and can just enjoy the pictures and words,  and even give words and commands to other computers and humans. Putting a lot of these commands together makes the phone or computer able to do things your human wants, like show how to get to the new dog park, or to tell other computers and humans far away to bring your treats in a package to the door!  Does that make sense? 

Are there any other dog or human questions I can assist you with?
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