How logically overflow forks?

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Greetings
I want to make a navigation menu. Using the code below:

CSS

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #a1a1a1;
}

everything works fine, but if I remove:

CSS

overflow: hidden;

the menu background disapears. How

CSS

overflow: hidden;

logically works in this code segment?

Here is the fiddle address:
JSFiddle

What I have tried:

I can't understand the logic behind

CSS

overflow: hidden;

.

Posted 13-Feb-19 8:21am

Ali Majed HA

Updated 14-Feb-19 3:31am

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enhzflep 13-Feb-19 15:39pm

Mate, it's impossible to give you a definitive answer in this case to the question "why does my code produce this result?" when you don't provide the code...

Basically, the UL element has a size and position calculated by the browser. The children of that UL element have combined sizes that exceed that of the UL. As a result, they can be said to overflow their parent container. When you tell the parent to hide any content that exceeds its boundaries (overflow: hidden) the result is that stuff disappears. simples.

Ali Majed HA 14-Feb-19 0:53am

Hey my friend, I have provided the full code in jsfiddle website with the link in question.
Thanks for your comment and explanation.

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Richard Deeming · Accepted Answer · 2019-02-14T03:31:00

It's an old technique to ensure that the parent element's height expands to include the floated children. Without it, the <ul>'s height collapses to zero, so the background colour has no effect.

Techniques for Clearing Floats | All About Floats | CSS-Tricks[^]
CSS: Clearing Floats with Overflow - Web Designer Wall - Design Trends and Tutorials[^]

For modern browsers, you could use Flexbox as an alternative. Remove the li { float: left; } rule, and replace overflow:hidden; with display:flex; on the ul rule:
Updated Fiddle[^]
A Complete Guide to Flexbox | CSS-Tricks[^]
Can I use... Flexbox[^]