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Using simple JS to dynamically control parameters within this URL to control content size, fitting the screen

Can I use some sort of JS script to take advantage of the size control here in the url
<iframe id="myIframe" src="https://media.embed.ly/1/frame?url=http%3A%2F%2Fwww.twitch.tv%2Fgamemode_mc_&width=1280&height=1280&secure=true&key=0202f0ddb5a3458aabf520e5ab790ab9&"
to dynamically force the size of the iframe content to match the user's browser window?
This will combine the solution to my original question with a secondary solution to provide the perfect fix for my problem here.
(My goal here is actually to place this Twitch feed as a background to my webpage - resizing the actual content of the iframe is actually a very unusual but additional treat here, because of the way Twitch's url works!)
To be clear, I'm very early in my learning of JS, and looking for a beginner solution to take the browser window size to dynamically control the parameters in this url to control the size of the content in this iframe.
width=1280&height=1280&
are the key lines here. I need to make these measurements follow the viewport size instead of being static. What method is best to do this?

I don't know if I get your question right but changing the width and height parameters of your iframe can be done by this (used jquery for getting height and width of window cross browser)
$(document).ready(function() {
var iframe = $("#myIframe");
iframe.attr("width",$(window).width());
iframe.attr("height",$(window).height());
});

How to allow vertical scroll in absolute layout?

I'm working on this website right now http://antoniobrandao.com/v4
All objects are placed in absolute positions. Unfortunately this doesn't enable vertical scrolling.
I've read that using position:static in a parent element (in my case, the DIV sections-wrapper ) would do the trick, and yes a scrollbar appears, but the contents seem visually destroyed when I attempt to scroll after setting position: fixed to my sections-wrapper DIV.
I'm new to HTML5 so if anyone could give me a hint I would be most thankful!
thanks

I found out the answer to my own question.
The solution was to manually (via JavaScript) set the height of my "sections-wrapper" and "background" to match the height of the contents of the sections within the "sections-wrapper".
This is because the "sections-wrapper" doesn't know automagically how tall is the stuff within itself, so we must tell it ourselves. The downside is that we must always be updating this values when the contents change height within the wrapper. Not too bad.
so if the stuff within my wrapper is eg. 1200px:
$('.background').css('height', '1200px');
$('#sections-wrapper').css('height', '1200px');

Is there a plugin for setting breakpoints in an element?

I regularly detect window width via enquire.js or media queries, but what if I want to style things differently based on the width of an element, say a div, and then change the appearance of its children based on its width? Thanks. I'm using SASS if that helps.

Does dreamviewer imagemap "coords" property change wrt browser viewport size?

I have added image map on my map based web page.
Since it is supposed to work on different resolutions, hot-spots defined in the image map have to be dynamically changed when browser viewport size changes.
ex: when I initially place a hot-spot in India and change the browser size it should still
placed on India not in somewhere else.
I saw that there is a property called "coords" containing 3 parameters.
Does these properties dynamically change when it changes the browser viweport size?
Or can I make them dynamically changing?
Or going to javascript is recommended?
(As far as I tested they are fixed to absolute locations.)

I did some research on imagemaps and found that;
They do not dynamically change their position when it changes the browser viewport size
I didn't tried to change'em dynamically. Hopefully you may able to do it with javascript
javascript was the solution for my problem
with the use of javascript ;
Browser viewport width and height can be taken
And relative to that width or height you can position the elements
imagemaps in dreamviewer is not a solution for this matter

iframe with fixed width and DYNAMIC height

Is it possible to use an iframe with a fixed width (.ex. 75%) and a dynamic height? Want I want to achieve is that when the page that is loaded into the iframe, it will not be wider than I have specified, but the lenght needs to be according to the page its content. Is it a page with 5 lines text, the frame will be just big enough to display these 5 lines. Are we loading a large document with 1000 lines, the Iframe height will be automatically adjusted.
Prerequisites:
The url in the frame is on a different domain from the parent.
The code should work on mobile phone browsers too.
Let's try to avoid jQuery if possible. (to make the above faster)

I know you'd like to avoid it, but it really shouldn't slow you down so much that it'd be a burden on your site. I've done far crazier things with jquery and it's handled it like a champ. When talking "dynamic" it's usually a safe bet that you will need to touch some javascript at some point :P
$(selector)[0].scrollHeight
As for making it dynamic? You could setup an interval to adjust the height.
Something like this:
function setHeight(selector){
var contentHeight = $(selector)[0].scrollHeight;
$('#iframe-id').attr('height', contentHeight);
}
Then you either load it on page load or you wrap it in a setInterval.
If it's just the jquery thing and you don't mind javascript, then this site could help you
http://www.mattcutts.com/blog/iframe-height-scrollbar-example/

IFrame height can be manipulated using the page rendering code, or JavaScript...but there is no way for the iframe to dynamically resize based on content.
The link in mplungjan's comment takes you to a really good post about this subject.