.... the reader button!?!

See this reader button in the address bar?

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I always thought it was a way to add it to the reading list, and had NEVER used it. While browsing lifehacker today I hit the button on accident...

I earned my humble pie for 2013

For those who are uninitiated like I was mere hours ago, this is what you get: adjustable sizing, word wrapping, and image laden goodness in a clean format. Not perfect, but great for many sites.

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BOOM! and yes Virginia, it's even more awesome holding it vertically. The only real problem I've run into is some articles with very wide images. A few features on The Verge do this, where text goes off the side of the reader page to the images margins.

I thought I was awesome, I have an iP5 and iPad Mini currently and in the past 12 months I've used Windows Phone 7.5, Android 4.0.4 - 4.1.2, and rooted/hacked both.

Did anyone else not know about this function, or am I the last one to the party?
What about some tech feature you didn't know about, stumbled upon, and wondered how you could've been so blind?