accessibility

Our marketing department has made a new homepage for our site that uses a looped .mp4 file of people walking down a hallway that's being used as the background for our header/logo area.

This question already has an answer here:

In Bootstrap there are dedicated alerts.
https://v4-alpha.getbootstrap.com/components/alerts/

i am getting ANR from reports

Apologies in advance: this is a bit of a long set-up for a short question!

Currently I am working on an app. that uses react and react-router v4 dom.

The screen reader is not recognising the screen changing despite using react-document-title.

I'd like to add to android widget more detailed description I.E I need an alternative to the HTML attribute aria-describedby for android.

I'm trying to find out a way of ignoring decorative text similar to ignoring decorative images using an empty alt.

Example:

I'm doing a bit of research into accessibility and one of the things that is asked is to put data- in-front of any data attributes.

I am using Accessibility with VoiceOver in my app.