Checkout Firefox Developer Edition, https://www.mozilla.org/en-US/firefox/developer/ https://www.mozilla.org/en-US/firefox/developer/ Create an HTML file and o

Checkout Firefox Developer Edition, https://www.mozilla.org/en-US/firefox/developer/ https://www.mozilla.org/en-US/firefox/developer/ Create an HTML file and open it up in the browser without a web server (though some advanced stuff will need a web server running). The developer tools built into the browser can be used to interact with the page and see how changing HTML, CSS, or JavaScript affects it. Web console can be used to experiment with JavaScript, https://firefox-source-docs.mozilla.org/devtools-user/web_console/index.html https://firefox-source-docs.mozilla.org/devtools-user/web_co...