https://www.w3.org/TR/webdriver/#element-click:

"Let visible width be rect’s bounding rectangle’s (max(x coordinate, x coordinate + width dimension)).

Let visible height be element’s bounding rectangle’s (max(y coordinate, y coordinate + height dimension)).

Let vertical centre offset be (visible width / 2.0).

Let horizontal centre offset be (visible height / 2.0).

Let centre point be a pair of rect’s (rectangle x coordinate + horizontal centre offset) and (rectangle y coordinate + vertical centre offset)"

(Let's omit the typo with visible height instead of visible width for horizontal center offset).

I don't understand such a math:

Say, x = 100, width = 5.

x center will be 100 + (100 + 5) / 2 = 152.5.
And it is out of the right rectancle boundary.


I think the x center should be calculated as:

0.5 * (max(0, min(x, x + width)) + min(innerWidth, max(x, x + width)))