Javascript

How many times you tried to install Magento 2 and later you could not see the website working !!, How many times you tried to search for these sentences 

"Magento 2 css not working"

"Magento 2 js not working"

"Magento 2 404 page not found" because of the static files?

Now here is the solution, and easily it is the missed .htaccess (for apache)

by quick look at this path "{magento root}/pub/static", you will see that you missed the .htaccess file

To change the time please copy this file 

vendor\magento\module-ui\view\frontend\web\js\view\messages.js

to your them to be in this path

app\design\frontend\{vendor}\{theme}\Magento_Ui\web\js\view\messages.js

then modify this function 

You can use this script to detect the screen size as you want