I got a same error while using MATHJAX in angular 7. I resolved by below pipe transform. 100% work perfectly
//Sanitize HTML PIPE
import { Pipe, PipeTransform, SecurityContext } from "@angular/core";
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Pipe({
name: 'sanitizeHtml'
})
export class SanitizeHtmlPipe implements PipeTransform {
constructor(private _sanitizer: DomSanitizer) {
}
transform(value: string): SafeHtml {
return this._sanitizer.sanitize(SecurityContext.HTML, this._sanitizer.bypassSecurityTrustHtml(value))
}
}