Created attachment 465700 [details]
Screenshot showing how Safari compute the acc name with "This" instead of "This is a label"

*Steps to reproduce:*

Code:

<label for="label">This</label>
<label for="label">is</label>
<label for="label">a</label>
<label for="label">label</label>
<input type="text" name="lb" id="label">


*Actual result:*

The computed accessible name is: "This"


*Expected result:*

Per https://www.w3.org/TR/html-aam-1.0/#accname-computation, section 4.1.1, point 2

"Otherwise use the associated label element or elements accessible name(s) - if more than one label is associated; concatenate by DOM order, delimited by spaces."

the computed accessible name should be: "This is a label" (concatenate by DOM order, delimited by spaces)