2
I’m trying to create the following picture

And I want to draw a line between each of them

I believe it’s taking the X and Y axis, how do I do it?
2
I’m trying to create the following picture

And I want to draw a line between each of them

I believe it’s taking the X and Y axis, how do I do it?
3
I have prepared a more flexible solution for you, based on the comments and without the need for any Javascript.
HTML:
<div id="wrapper">
  <div id="elements">
    <div class="negate"></div>
    <div class="element"></div>
    <div class="element"></div>
    <div class="element"></div>
    <div class="element"></div>
  </div>
</div>
CSS:
#elements {
  width: 420px;
  height: 220px;
  border: 2px solid black;
}
.element {
  width: 200px;
  height: 100px;
  margin: 5px;
  float: left;
  border: 2px solid black;
  box-sizing: border-box;
}
.negate {
  background: 
    linear-gradient(to top left,
      rgba(255, 0, 0, 0) 0%, 
      rgba(255, 0, 0, 0) calc(50% - 3px), 
      rgba(255, 0, 0, 1) 50%, 
      rgba(255, 0, 0, 0) calc(50% + 3px), 
      rgba(255, 0, 0, 0) 100%);
  width: inherit;
  height: inherit;
  position: absolute;
}
To play and test, I prepared this jsFiddle. For a closer look to that presented by you, see the update 1.
css3, Nice! Front-end op
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You can play with Canvas.
– Victor Martins
The lower left point is
(div3.pageX, div3.pageY + div3.height); the upper right is(div2.pageX + div2.width, div2.pageY).– mgibsonbr
It’s not quite what you want, but here is a CSS3 solution. Based in that reply soen
– Anthony Accioly
How about this, based on what Anthony put up, is what you want? http://jsfiddle.net/s4bNw/
– Pedro Lorentz
Might be, but would it look better with div or take a look at canvas as @dxhj commented
– Rod
The two solutions are acceptable, I believe.
– Victor Martins