viking7982 commented on code in PR #18436:
URL: https://github.com/apache/echarts/pull/18436#discussion_r1154292247


##########
src/component/tooltip/TooltipHTMLContent.ts:
##########
@@ -291,14 +291,21 @@ class TooltipHTMLContent {
         (el as any).domBelongToZr = true;
         this.el = el;
         const zr = this._zr = api.getZr();
-        const appendToBody = this._appendToBody = opt && opt.appendToBody;
 
-        makeStyleCoord(this._styleCoord, zr, appendToBody, api.getWidth() / 2, 
api.getHeight() / 2);
-
-        if (appendToBody) {
-            document.body.appendChild(el);
+        let customContainer: HTMLElement | null
+        if (opt && opt.appendToBody) {
+            customContainer = this._customContainer = document.body
+        } else if (opt && opt.getAppendElement) {

Review Comment:
   > @plainheart Thanks for the information about `teleport`, and yes I think 
it should be better be in the tooltip option than `init`. As about the naming, 
I thing `appendTo` is a better name and `appendToBody` can be replaced as 
`appendTo: document.body` or `appendTo: 'body'` (using query selector).
   
   
   Thanks.
   I updated my pr. Now the config name is `appendTo` and it's value can be a 
   
   - string : a string used by query selector  such as 'body', 
‘.scroll-container’ and so on
   - function: a function to local a element like `(e) => 
e.closest('.scroll-container')`, in which the input `e` is the chart container
   - domElement: a element for tooltip
   
   
   
   



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