Hello,
I installed the Mega Menu 8.x-1.4 on my drupal 8.5.3. its submenu item does not work on iphone portrait mode; I tried it on iphone 6 and iphone X. Either one does not work. There are some submenu items under CATEGORY menu; but on iphone portrait mode, the CATEGORY's sub menu items do not show up. By the way, the submenu items are created by the module, Hierarchical Taxonomy Menu. (https://www.drupal.org/project/hierarchical_taxonomy_menu)
You can browse the site, http://freshdemo.foundermart.com
Below is the screenshot of iphone portrait mode: (it DOES NOT work), the submenu items under CATEGORY did not show up.
The following photo is the screenshot of iphone landscape mode, it works. (the submenu items under CATEGORY show up.)
Hi,
This is the error of your theme's css (in file : themes/bartik/css/components/primary-menu.css)
On small screen, the height of tag <li> is set = 0. If remove this, it will be ok
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Thanks. It works now.