What does زر علامة تحديد look like on Mozilla?

On Mozilla it is the design shipped in Firefox OS 2.5, shown above at full size. Older revisions are listed beneath it.

When did Mozilla add زر علامة تحديد?

Mozilla first drew زر علامة تحديد in Firefox OS 2.5, released 30 يناير 2016.

Mozilla Foundation has shipped 1 version of زر علامة تحديد. Each is dated, so you can see when the design changed.

Mozilla

Mozilla Foundation has drawn زر علامة تحديد once. Every revision Mozilla has shipped is below, newest first.

What does زر علامة تحديد look like on Mozilla?: On Mozilla it is the design shipped in Firefox OS 2.5, shown above at full size. Older revisions are listed beneath it.
When did Mozilla add زر علامة تحديد?: Mozilla first drew زر علامة تحديد in Firefox OS 2.5, released 30 يناير 2016.
How many times has Mozilla redrawn زر علامة تحديد?: Mozilla Foundation has shipped 1 version of زر علامة تحديد. Each is dated, so you can see when the design changed.