You might want to take a look at :
http://docs.w3cub.com/http/headers/content-security-policy/frame-ancestors/
https://stackoverflow.com/questions/38277526/webview-content-security-policy

Also, make sure to enable "Allow Cross Origin" as it seems like you're working with local files.

Yes, It will be safe and policy compliant.

You need to check the console logs by debugging to get into the exact error:
https://websitetoapk.com/docs/debugging-with-chrome.html

@Jayaprakash , We always take care of policy compliance as any change affects all of our users.

@Jayaprakash , We do not always keep it enabled by default, in case you need it, you can enable.

@OpTeo , In that case, you can reach out to our support:
https://websitetoapk.com/support/

@apps123 ,

As of now, we only have 1 year plans for the license.

However, you need not to worry as our support is always there for you. We are working on adding up more features and keep updating product with latest google play policy compliance.

Product is surely usable and most of the users can use it without any support requirements as we have already made it so easier to use. However, We are not going to discontinue support or related services.

@olipiskandar , You can debug your app as follows :
https://websitetoapk.com/docs/debugging-with-chrome.html

@Jongchan Park We are working on the issue and will provide best possible solution as soon as possible by releasing a minor update.

Possible quick fix: Use "HTTPS" only in your website so that it ensures there won't be any security issue.

@monika , Consider going through following conversations:

https://websitetoapk.com/forums/85-wideview-overview-mode-enable-flash

https://websitetoapk.com/forums/253-open-a-website-as-desktop-view-in-app/