ℝ𝕖𝕓𝕣𝕒𝕟𝕕 𝕒𝕝𝕝 𝕥𝕙𝕖 𝕥𝕙𝕚𝕟𝕘𝕤: ℂ𝕙𝕚𝕣𝕡 → 𝕋𝕙𝕖 𝕏 𝔽𝕠𝕟𝕥

x.js

let csetSrc = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
let csetDest = ['𝕒','𝕓','𝕔','𝕕','𝕖','𝕗','𝕘','𝕙','𝕚','𝕛','𝕜','𝕝','𝕞','𝕟','𝕠','𝕡','𝕢','𝕣','𝕤','𝕥','𝕦','𝕧','𝕨','𝕩','𝕪','𝕫','𝔸','𝔹','ℂ','𝔻','𝔼','𝔽','𝔾','ℍ','𝕀','𝕁','𝕂','𝕃','𝕄','ℕ','𝕆','ℙ','ℚ','ℝ','𝕊','𝕋','𝕌','𝕍','𝕎','𝕏','𝕐','ℤ','𝟘','𝟙','𝟚','𝟛','𝟜','𝟝','𝟞','𝟟','𝟠','𝟡']

for (let el of document.querySelectorAll('*')) {
    // ignore non-user-visible
    if (el.style.display == 'none' || el.style.visibility == 'hidden') {
        continue
    }
    if (el.tagName == 'SCRIPT' || el.tagName == 'STYLE' || el.tagName == 'TEXTAREA') {
        continue
    }

    // get text content
    if (!el.firstChild) {
        continue
    }
    let text = el.firstChild.nodeValue
    if (!text) {
        continue
    }
    let oldText = text
    // replace all characters in csetSrc with corresponding characters in csetDest
    for (let i = 0; i < csetSrc.length; i++) {
        text = text.replaceAll(csetSrc[i], csetDest[i])
    }
    el.firstChild.nodeValue = text
    console.log(`replaced ${oldText} with ${text}`)
}