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Microsoft Visual Studio might be a bit more popular than HTML5 Please. We know about 1 link to it since March 2021 and only 1 link to HTML5 Please. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
According to html5please.com and caniuse.com, supporting those browser is quite hard (thanks to IE), but could be done using polyfill such as FlashCanvas and FileReader. Source: about 3 years ago
While the editor seems to old fashioned there isn't anything particularly wrong in using it for learning. Alternatively you can propose to your teacher about https://visualstudio.microsoft.com/vs/express/ . IMO editor is not a big factor when we are talking about high school learning. Source: almost 4 years ago
QuirksMode.org Compatibility Tables - My Compatibility Tables are by far the most popular resource on this site.
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Can I use - Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Can I Email - "Can I use" for email. Quickly view if a tech is supported by all email clients.
VS Code - Build and debug modern web and cloud applications, by Microsoft