Briefly;
JS/NodeJS (middle)
Pure HTML/CSS
Ui-Ux (Bootstrap, Bulma, Tailwind, FlatUI, etc)
Jquery + any frameworks
3D (ThreeJS/Babylon)
2D (Pixi/Phaser/HTML)
Audio (effects / cut / merge / concat / convert audiofile on pure JS)
Anim (GSAP,ScrollMagic, etc)
Browser Extensions