Css Class name is removed after converting the content

[pujashilpy]

I have few css classes added to my content , but it is automatically removed by the quill when parsing it .

what i actually need is to change the content manually on input change which is handled by angular5 , so i would need a selector preferably a css class name or id so that i can change the innerHTML of it.

Let me know if there are any other options to get my requirement done