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How to add HTML Tag in dcc.textarea

I want to add some keywords with different color in dcc.textarea’s value, so I use visdcc to add Javascript and it helps me to identify the keywords, but the HTML style does not work. My code just like it.
var ta = document.getElementById(‘textarea_id’);
text=ta.value;
words=[‘hello’,‘why’];
var i, len = words.length, re;
for (i = 0; i < len; i++) {
re = new RegExp(words[i], ‘g’);
if (re.test(text)) {
text = text.replace(re, ‘$1’);
}
}
ta.value=text
And if I change the last line as
ta.innterHTML=text

It doesn’t work either.

Looking forward kindly help. THX…!!!