[Webkit-unassigned] [Bug 212197] New: Rendering artifacts on contenteditable element with box-shadow and outline

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212197

            Bug ID: 212197
           Summary: Rendering artifacts on contenteditable element with
                    box-shadow and outline
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: robbert.brak at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 399950

  --> https://bugs.webkit.org/attachment.cgi?id=399950&action=review

Rendering artifacts

To reproduce:

1) Create a page with the following HTML:

<div class="editor" contenteditable="true" />

and the following CSS:

.editor {
  width: 400px;
  min-height: 40px;
  border: 1px solid blue;
  border-radius: 2px;
  box-shadow: 0 0 4px rgba(51,136,221,0.5);
  outline: 4px solid transparent;
  padding: 4px;
}

See also https://codepen.io/rubrick/pen/rNOPLGW. 

2) Put the cursor in the contenteditable box and press <enter> a few times.

Result: rendering artifacts appear along the edges of the box, as seen in the attachment. These artifacts disappear when you resize the browser.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20200521/2ca9d184/attachment-0001.htm>