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https://webaim.org/resources/contrastchecker/

https://www.freecodecamp.org/news/css-only-back-to-top-button/

https://fontawesome.com/changelog

https://github.com/mackilroy007/font-awesome-v6

Using Node js:

1. download icons.json file
2. execute following code in node js:

var json = require("{file-path}/icons.json"); 
var FA6Json = {}; Object.keys(json).forEach(iconName => { const icon = json[iconName]; icon.styles.forEach(style => { if (!FA6Json[style]) { FA6Json[style] = []; } FA6Json[style].push(`fa-${style} fa-${iconName}`); }) }); require("fs").writeFile("{file-path}/FA6icons.json", JSON.stringify(FA6Json,null,2), () => {});