[Webkit-unassigned] [Bug 218890] New: [iOS 14] window.getSelection().getRangeAt(0) on iOS 14 WKWebView not return startOffset as other browsers and iOS 13 WKWebView

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218890

            Bug ID: 218890
           Summary: [iOS 14] window.getSelection().getRangeAt(0) on iOS 14
                    WKWebView not return startOffset as other browsers and
                    iOS 13 WKWebView
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xiehaiyan_xhy at sina.com

In iOS 13 WKWebview and other browsers such as Chrome, when call window.getSelection().getRangeAt(0), it will return the tap character index.
But on iOS 14 WKWebview, window.getSelection().getRangeAt(0) doesn't return character index, but seems to return a word end index in en language.

My question is:
Can we fix this to keep the same as other browsers and iOS 13 WKWebView?

Details as below:

Code:
document.addEventListener('click', (event) => { 
    var range = window.getSelection().getRangeAt(0);
    console.log("startOffset: "+ range.startOffset.toString());
});

Test case 1: 
Action: There is a sentence in website as "Test click on website", click at the end of "e" in "Test".
Output: 
In iOS 13 WKWebview and other browsers:     startOffset: 2
In iOS 14 WKWebview:      startOffset: 5


Also in iOS 14 WKWebview the word ending rule is not the same, when click on the first word in the node, return index will include whitespace, as we see in test case 1.

But some others return index which not include whitespace as Test case 2.

Test case 2:
There is a sentence in website as "Test click on website", tap at the end of "l" in "click"
Output: 
In iOS 13 WKWebview and other browsers:     startOffset: 7
In iOS 14 WKWebview:      startOffset: 10

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