demo · v133

area vs anchor parity probe

A live IDL probe: does the property reflect through el.attributionSrc on both <a> and <area>? Before 133 the attribute parsed but the IDL accessor returned undefined on <area> — analytics libraries had no way to read it back.

<a> element

Anchor link
tagName— getAttribute— .attributionSrc— read-back works—

<area> element

region Image map demo target
tagName— getAttribute— .attributionSrc— read-back works— 
…

why this matters

Image maps still ship: travel sites use them for region pickers; ad tools generate them for creatives with irregular hot-spots. Attribution Reporting wires its measurement through attributionsrc, so analytics SDKs that traverse the page looking for measurement-capable elements need a uniform IDL read across <a> and <area>. Before 133 the SDK would see the attribute on serialised HTML but get undefined from the live DOM. 133 fixes the IDL exposure without changing the click behaviour.

see also

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