Modern Browser

In most cases, it refers to Chrome, Safari, Edge and Firefox. Edge and Chrome both derived from Chromium project, so basicly, modern browser means Chromium, Safari and Firefox.

Chromium and Firefox are open source, Safari partially(webkit) is open source.

https://github.com/chromium/chromium
https://github.com/mozilla/gecko-dev
https://github.com/WebKit/WebKit

HTML/CSS/Javascript

They are origin resources for browser to render pages, and developed by front-end engineers.

So, in real world, there are two roles:

1. Browser engineers => develop browser to render pages
2. Front-end engineers => develop HTML/CSS/Javascript resources to feed browser

The resource standard spec is the key to guide development process.

All spec is open source, welcome anyone to contribute and discus.

https://github.com/whatwg/html/
https://github.com/w3c/csswg-drafts/
https://github.com/tc39/

Spec Clue

Example: Javascript New Feature: Import Assertions

import json from "./foo.json" assert { type: "json" };
import("foo.json", { assert: { type: "json" } });

This feature need change javascript grammer, so, it got a tc39 proposal:

https://github.com/tc39/proposal-import-assertions

This feature related to resource load, in browser context, load resource is HTML responsibility.

So, it got a whatwg PR:

https://github.com/whatwg/html/pull/5658

Implement Clue

New feature on Chrome status can be found at https://chromestatus.com/

For example: Import Assertions: https://chromestatus.com/feature/5765269513306112

It contains develop status page link: https://bugs.chromium.org/p/chromium/issues/detail?id=1132413 and other browsers attitude.

Chromium Bugs page contains V8 develop status page link: https://bugs.chromium.org/p/v8/issues/detail?id=10958 and other commit link.

V8 Bugs page contains commit link.

From these infomation, we can know the real status of Import Assertions that on Chrome modern web browser.