html5 meta tag cache-control no longer valid?

Question

How do I define

in HTML5? It is no longer valid according to the W3C Vali

Answer 1

In the beginning of code you need to use this:

...

Then create cache.manifest file with content of what you want to cache i.e

CACHE MANIFEST
# 2010-06-18:v2

# Explicitly cached 'master entries'.
CACHE:
/favicon.ico
index.html
stylesheet.css
images/logo.png
scripts/main.js

# Resources that require the user to be online.
NETWORK:
*

# static.html will be served if main.py is inaccessible
# offline.jpg will be served in place of all images in images/large/
# offline.html will be served in place of all other .html files
FALLBACK:
/main.py /static.html
images/large/ images/offline.jpg

A manifest can have three distinct sections: CACHE, NETWORK, and FALLBACK.

CACHE: This is the default section for entries. Files listed under this header (or immediately after the CACHE MANIFEST) will be explicitly cached after they're downloaded for the first time.

NETWORK: Files listed in this section may come from the network if they aren't in the cache, otherwise the network isn't used, even if the user is online. You can white-list specific URLs here, or simply "", which allows all URLs. Most sites need "".

FALLBACK: An optional section specifying fallback pages if a resource is inaccessible. The first URI is the resource, the second is the fallback used if the network request fails or errors. Both URIs must from the same origin as the manifest file. You can capture specific URLs but also URL prefixes. "images/large/" will capture failures from URLs such as "images/large/whatever/img.jpg".