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HTML

CSS

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JavaScript

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HTML

              
                <html>
  <div class="head">
  <p>I am a paragraph, a block element, taking the full-width of the page just like my container, div. "See my borders"</p>
  <p>
    I am an <span class="span-1">inline span element</span> inside a block element. They allow me space on the right/left but nothing on top/bottom :(
  </p>
  <p>
    Here comes the best of both-worlds, inline-block. The <span class=span-2>inline-block</span> to the rescue. 
  </p>
</div>
<h1>I am another block-level element just stretching out.</h1>
<h2>Am a smaller heading yet a block element. But, you can override my behaviour by changing the display property.</h2>
</html>
              
            
!

CSS

              
                /*Basic CSS reset */

html, 
body {
    /*look how you get the entire box/browser window to play around. Another topic for another day though.*/
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: sans-serif, Arial;
}

*, *::before, *::after {
    box-sizing: inherit;
}

/* Block element styles */
.head {
  background-color: #f1425d;
  color: #fff;
  height: 280px;
}

.head p {
  padding: 10px;
  border: 5px solid #39ff14;
}

/* Span styles */

.span-1, .span-2 {
  background-color: #000;
  color: white;
  width: 100%; /* oh common, I am an inline element */
}

.span-1 {
  margin-top: 50px; /*nothing happens*/
  padding: 5px 30px;
}

.span-2 {
  display: inline-block;
  /* check these out */
  margin-top: 10px;
  margin-bottom: 10px;
}

/* Overriding h2's default behaviour (not the actual type) making in an inline element. */

h1 {
    border: 2px solid red;
    padding: 10px;
    margin-top: 10px;
}

h2 {
  border: 2px solid purple;
  padding: 10px;
  margin-top: 20px; /* Now, I can't make this happen. */
  display: inline; /* but you can fit another element (img?) next to me! */
  width: 100%: /* why? but why? told you won't work :p */
  height: 500px; /* okay, bye! */
}
              
            
!

JS

              
                
              
            
!
999px

Console