Apple's iOS-based products never supported Adobe Flash, which was a massively popular tool to create interactive website experiences. While Flash was a proprietary technology, it made possible what HTML and CSS were not capable of handling: animation and complex interactivity. With Adobe Flash being a major player in the Web industry at the time, Apple was a target of criticism from business pundits and iOS device users.
In response to public outcry, Steve Jobs published an open letter titled "Thoughts on Flash": a brief article that outlined the tool's various shortcomings and labelled Flash as buggy, slow, and unreliable. Jobs, predicting that open web standards will prevail in the rise of mobile devices, expressed support for HTML5, CSS3, and JS, which had little market share as a relative young set of tools. Adobe retaliated with its print advertisement campaign titled "We Love Apple," where the company warned that Apple is actually looking to limit developer freedom, but HTML5 quickly gained its traction as Apple's mobile devices dominated the market.
In this competitive market where different industry giants offer and maintain their own frameworks (Angular by Google, React by Facebook), jQuery remains the most popular framework of them all. Initially designed to reduce interpretation discrepancies between various browsers as per its slogan "Write Less, Do More," jQuery continues to maintain its 95%+ market share around the world due to its ease of use.