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@@ -3721,4 +3721,36 @@ void Document::remove_form_associated_element_with_form_attribute(HTML::FormAsso
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});
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}
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+// https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint
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+Element const* Document::element_from_point(double x, double y)
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+{
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+ // 1. If either argument is negative, x is greater than the viewport width excluding the size of a rendered scroll
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+ // bar (if any), or y is greater than the viewport height excluding the size of a rendered scroll bar (if any), or
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+ // there is no viewport associated with the document, return null and terminate these steps.
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+ auto viewport_rect = this->viewport_rect();
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+ CSSPixelPoint position { x, y };
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+ // FIXME: This should account for the size of the scroll bar.
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+ if (x < 0 || y < 0 || position.x() > viewport_rect.width() || position.y() > viewport_rect.height())
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+ return nullptr;
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+
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+ // Ensure the layout tree exists prior to hit testing.
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+ update_layout();
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+
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+ // 2. If there is a box in the viewport that would be a target for hit testing at coordinates x,y, when applying the transforms
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+ // that apply to the descendants of the viewport, return the associated element and terminate these steps.
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+ if (auto const* paintable_box = this->paintable_box(); paintable_box) {
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+ if (auto result = paintable_box->hit_test(position, Painting::HitTestType::Exact); result.has_value()) {
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+ if (auto* dom_node = result->dom_node(); dom_node && dom_node->is_element())
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+ return static_cast<Element const*>(dom_node);
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+ }
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+ }
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+
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+ // 3. If the document has a root element, return the root element and terminate these steps.
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+ if (auto const* document_root_element = first_child_of_type<Element>(); document_root_element)
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+ return document_root_element;
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+
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+ // 4. Return null.
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+ return nullptr;
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+}
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+
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}
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Tim Ledbetter