Can inline-block elements be justified aligned over multiple lines - html

Question

I have many varied cases where I would like a DIV containing an inline-block menu element - typically an anchor - to act as if vertically justifying the elements, when an element overflows on to multiple lines.
I will use one example case to explain what I would like to achieve:
See my codepen:
http://codepen.io/anon/pen/wBRpqJ?editors=110
Output:
What happens is that if the browser resizes to a smaller size, then the final inline-block Anchor element falls down onto a new line, see screenshot (at width ~725px):
Output:
That's fine, in itself, but what I would like it to do is to split the elements within the DIV equally, as it's on two lines, to then be equally dispersed over two lines and therefore be roughly justified, If you resize the codepen to approximately 500px wide you will see how I'd like it to look if the elements can not all stay on one line. So the image below would be would I would like to see if any line breaking occurs within the parent DIV element.
Output:
I realise that the term equally is an exact term for an inexact situation but to justify the elements in a block so that each row in the block has the same number of elements +/- 1 (for odd counts).
Is this something that can be done with CSS?
P.S> The contents of these elements are dynamic and varied and the situations any solution would be useful for would also be dynamic and varied so solutions specifically for this case will probably not help.
Edit:
Flexbox has been suggested as a solution, how would I use Flexbox to achieve the desired result?
Edit 2:
Criteria -- The elements in the menu are centre aligned and are each separate inline-blocks . Justifying them all it does is screw up the centre alignment and add extra spacer lines around the Anchor elements in the NAV container.
Edit 3:
I will put my code here, used on the codepen example:
CSS:
.mainbox {
width:90%;
max-width:1200px;
min-width:400px;
margin:0.4em auto;
font-family: Arial, Helvetica, sans-serif;
font-size: 1em;
border: 1px solid #006;
}
nav {
background-color: rgba(204,204,204,0.4);
padding:5px 5px 0px 5px;
text-align:center;
position: absolute;
/* bottom increased from zero to make example clearer on codepen */
bottom:1em;
margin:auto;
width:90%;
/* width adjusted from 100% for codepen layout */
}
nav a {
font-size: 0.9em;
font-weight: bold;
text-decoration: none;
padding:2px 4px;
color: #000;
border: 1px solid #000;
line-height: 1.1em;
background-color: #DDDDDD;
margin:0 3px 3px 3px;
display:inline-block;
}
nav a:hover, nav a:focus {
background-color: #FFFFFF;
color:#000000;
text-decoration: none;
}
HTML:
<div class="mainbox">
<header>
<nav>
Availability
Tariff
Make A Booking
Access Statement
T&Cs
Contact
<a href="http://www.elsewhere.co.uk" title="Visit the website">
Parent Site</a>
</nav>
</header>
</div>

Answer 1

You have to use the :after pseudo element hack. Basically it works like you're justifying text. In order to get the last line to justify, you have to force a fake line using :after to get the browser to justify the last line. Just think about how justify works, it never justifies the last line.
.menu {
margin: 0;
padding: 0;
text-align: justify;
font-size: 0;
}
li {
display: inline-block;
font-size: 24px;
width: auto;
background-color: #ccc;
text-align: center;
padding: 0 10px;
border: 1px solid black;
margin:10px;
}
ul:after {
display: inline-block;
width: 100%;
content: '';
}
<ul class="menu">
<li>Item 12341231</li>
<li>Item 123462346</li>
<li>Item 234523</li>
<li>Item 34563457</li>
<li>Item 456756</li>
<li>Item 567856</li>
<li>Item 678969</li>
<li>Item 7453456</li>
<li>Item 8234523</li>
</ul>

Answer 2

One trick might be to use media queries:
#media (max-width: 725px) {
.parent-div {
width: 500px;
}
}
Not perfect, but setting these will wrap everything just the way you want it.

Answer 3

This workaround is also based on #media, but using a pseudo element to make line break.
#media screen and (max-width: 750px) {
nav span:nth-of-type(4)::after {
content: "";
display: table;
height: 10px;
}
}
Note: I added a <span> tag around each <a> in order to make it happen.
Demo: http://jsfiddle.net/s88381hb/1/

Answer 4

You can use CSS to do this but you can use javascript to enforce the CSS whichmight be more beneficial