# [Bug 29776] New: Wrong mathematics at element center calculations.

• From: <bugzilla@jessica.w3.org>
• Date: Wed, 17 Aug 2016 12:42:45 +0000
• Message-ID: <bug-29776-5015@http.www.w3.org/Bugs/Public/>
```https://www.w3.org/Bugs/Public/show_bug.cgi?id=29776

Bug ID: 29776
Summary: Wrong mathematics at element center calculations.
Product: Browser Test/Tools WG
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: WebDriver
Assignee: public-browser-tools-testing@w3.org
Reporter: alexchem@yandex.ru
QA Contact: public-browser-tools-testing@w3.org
CC: mike@w3.org
Blocks: 20860
Target Milestone: ---

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)))

Referenced Bugs:

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20860
[Bug 20860] WebDriver Level 1
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Received on Wednesday, 17 August 2016 12:42:54 UTC