#if UNITY_WEBGL && !UNITY_EDITOR not get stripped in webgl build:D

Update: Both

#if UNITY_WEBGL && !UNITY_EDITOR

and

#if UNITY_WEBGL && !UNITY_EDITOR

work as intended.
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Update: It turns out to be some functions name conflicts in web template index.html, while the functionality of platform specific compilation code has not been tested yet. Thank you for your time.
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Editor: 2019.4.9f1.
In convenience of testing in editor, I tried to use platform dependent compilation,

#if UNITY_WEBGL && !UNITY_EDITOR

, for those running only in webgl, such as

recieveData(string json)

method called by javaSritpts,

[DllImport("__Internal")] private static extern void querySceneCode();

jslib plugin method, etc.

And

#if UNITY_EDITOR

for those testing in Editor only.

But the webgl-only codes,

#if UNITY_WEBGL && !UNITY_EDITOR

, seem to be stripped in build.

In addition, I tried

#if !UNITY_WEBGL || UNITY_EDITOR

for the codes not for webgl build,
but it seems to always run in runtime in webgl build.

Any Help will be appreciated.