mouseover-detect

This module will load a library into your theme that will let you know when the browser is supporting mouseover event.

Since the last 20 years had been assumed that all browser will have mouseover events, but with the not so late introduction to mobile devices and also computers with touchscreen this assumption causes undesired behaviors.

These are some of the issues you might experience:

• Mobile Devices: When styles are added for :hover on links, this causes on mobile that the first touch (click), won't fire the desired action, it will instead activate the hover state of the link, and a second click will be needed to get the desired click behavior, this is solved by removing the CSS style :hover from the link, therefore the first click will result in the real click behavior.
• Remove :hover only from Mobile Devices: There are some libraries that try to detect if the browser is using a Mobile devices, either by measuring width of the browser or by inspecting on Javascript the navigator.userAgent value, the problem with this, is that this would't work with existing known mobile devices, but as soon as a new browser or mobile device were to be promoted, this approach wouldn't work, also, this doesn't take into consideration, that you might use a Mouse connected through bluetooth, in which case, you would trigger "mouseover" events.
• Rely on Width: Similar to the above approach, this doesn't take into account that you can actually resize your desktop browser width, neither you would have a way to predict all mobile devices width's.

Solution

The approach we use is to actually detect mouseover event, as soon as the user moves the mouse, class has-mouseover will be added to html tag.

Now, instead of adding styles to links as this:

a:hover{
  text-decoration: underline;
}

You would do it as:

html.has-mouseover a:hover{
  text-decoration: underline;
}

With this approach you cover the following situations:

• If user has a mobile device, mouseover won't be triggered, therefore the a:hover rule won't be present, and the first click on the link will trigger the desired behavior.
• If user has a mouse connected to desktop computer, tablet, mobile, or any kind of device, has-mouseover will be added as soon as mouse is moved inside the website, therefore all :hover or rules that you prefix with html.has-mouseover will be present.

How to use

1. Install this module through composer:
   composer require drupal/mouseover-detect
2. Enable mouseover-detect module.

Once module is enabled, you will see has-mouseover class in the html tag, from here you can create :hover styles that depend on this class, so that it works only when mouseover has been detected.