Drupal 8.x

Is there any way in Drupal 8 to know whats the current page url in custom module.

I mean if I call dsm, then on every page it should give me that page's url.

I know the function to get current path, but dont know where to call them

Im having a difficult time finding a simple solution to play my audio files using html5.

I have a File field type that is linking to my mp3 file. Under "Manage Display" I would like to select a display format for html5 that would display the mp3 in a html5 player.

I would think this is simple to do but cant seem to find a way to do it. I do NOT want to use a flash player.

I have a D8 site with a theme based on Bootstrap.
I'm using Superfish for the main menu, and all is well - except that the little arrow indicator triangles that show that an item has a submenu aren't showing - but this only happens in Chrome.
They work fine in Safari and Firefox.
The triangles are implemented in an :after pseudo-selector like so:

Hello
Can someone help me about instaling demo theme onepage for d8, by weebpal.
always geting messages with error or blank screen.
Please help me about instalation, using drupal 8.1.8 , I doing something wrong but dont know what.
Please help.

Thanks forward

Hello
Can someone help me about instaling demo theme onepage for d8, by weebpal.
always geting messages with error or blank screen.
Please help me about instalation, using drupal 8.1.8 , I doing something wrong but dont know what.
Please help.

Thanks forward

So Im using the latest Drupal 8, and My website is just about wrapped up!

Only issue I need to solve is I want a User submitted image gallery (Will be used for users to submit Meme's). I want unregistered users to be able to submit them, then they will pend approval from my admins and I. Once approved they will be shown in a View.

I ASSUME (Scary when I do that) I want to make a new comment type specifically for these Memes, and only have an image field, then have a new view that shows published "Meme comments"?

How do I include the "post comment" in the header?