Because Eaglercraft is a third-party project, Mojang Studios (now Microsoft) does not officially endorse it. However, as long as you own a legitimate copy of Minecraft Java Edition, most fair-use arguments apply.
Most Eaglercraft clients allow you to upload your own skins or use a URL to fetch your official Minecraft skin. Why 1.7.10 is the "Sweet Spot" eaglercraft 1.7.10
: Always be sure to backup your single-player worlds by exporting them as .epk files, as clearing your browser cache can delete your progress! Because Eaglercraft is a third-party project, Mojang Studios
: Often referred to as part of the "Silver Age" of Minecraft, 1.7.10 is prized for being one of the most stable versions for older hardware. Modding Potential The browser's "Page Unresponsive" warning flickered like a
Suddenly, the screen began to tear. The browser's "Page Unresponsive" warning flickered like a warning light on a submarine. The school’s IT department was closing in, running a script to kill any unauthorized Java processes.