{"version":"1.0","type":"rich","title":"DOMTokenList polyfill for IE < 9; implements element.classList","description":"This example shows a JavaScript polyfill that implements the DOMTokenList API to support the `element.classList` property in Internet Explorer 9 and earlier. The code defines the standard methods `add`, `remove`, `toggle`, `contains`, and `item`, and it also patches native implementations in IE 10/11 and Firefox to accept multiple arguments. It stores class lists internally and updates the element’s `className` attribute or SVG `class` attribute when changes occur. The polyfill uses plain DOM methods like `setAttribute` and array operations such as `splice` and `indexOf`.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-6d8e378dc5cfe1a964581a08660fd621?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}