404 page

Question

Hello everyone
I build games template that i want to publish it in Themeforest for $25 as my first experience in it.
The website Depends on many servers that gives free iframe's games.
1) Please give me some advices to do in my website
2) how can i build 404 page(broken link page) that appear in every bronken link without adding in all of the tags onerror event
3) my template is pure Html Css jQuery , No php or mySql. Is there any chances to accept my template?

Answer 1

404 and similar errors are handled by .htaccess in the server.
So you do not need to care about that while making the front-end UI. The person who will buy it knows what to do.
In the web host service you can find a .htaccess file. Add
ErrorDocument 404 /404error.html
See this 404 page:
https://www.niush.tk/not_found.html