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@@ -2344,6 +2344,54 @@ void Element::scroll_by(HTML::ScrollToOptions options)
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scroll(options);
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}
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+// https://drafts.csswg.org/cssom-view-1/#dom-element-checkvisibility
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+bool Element::check_visibility(Optional<CheckVisibilityOptions> options)
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+{
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+ // NOTE: Ensure that layout is up-to-date before looking at metrics.
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+ document().update_layout();
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+
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+ // 1. If this does not have an associated box, return false.
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+ if (!paintable_box())
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+ return false;
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+
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+ // 2. If an ancestor of this in the flat tree has content-visibility: hidden, return false.
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+ for (auto* element = parent_element(); element; element = element->parent_element()) {
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+ if (element->computed_css_values()->content_visibility() == CSS::ContentVisibility::Hidden)
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+ return false;
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+ }
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+
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+ // AD-HOC: Since the rest of the steps use the options, we can return early if we haven't been given any options.
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+ if (!options.has_value())
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+ return true;
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+
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+ // 3. If either the opacityProperty or the checkOpacity dictionary members of options are true, and this, or an ancestor of this in the flat tree, has a computed opacity value of 0, return false.
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+ if (options->opacity_property || options->check_opacity) {
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+ for (auto* element = this; element; element = element->parent_element()) {
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+ if (element->computed_css_values()->opacity() == 0.0f)
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+ return false;
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+ }
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+ }
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+
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+ // 4. If either the visibilityProperty or the checkVisibilityCSS dictionary members of options are true, and this is invisible, return false.
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+ if (options->visibility_property || options->check_visibility_css) {
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+ if (computed_css_values()->visibility() == CSS::Visibility::Hidden)
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+ return false;
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+ }
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+
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+ // 5. If the contentVisibilityAuto dictionary member of options is true and an ancestor of this in the flat tree skips its contents due to content-visibility: auto, return false.
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+ // FIXME: Currently we do not skip any content if content-visibility is auto: https://drafts.csswg.org/css-contain-2/#proximity-to-the-viewport
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+ auto const skipped_contents_due_to_content_visibility_auto = false;
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+ if (options->content_visibility_auto && skipped_contents_due_to_content_visibility_auto) {
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+ for (auto* element = this; element; element = element->parent_element()) {
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+ if (element->computed_css_values()->content_visibility() == CSS::ContentVisibility::Auto)
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+ return false;
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+ }
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+ }
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+
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+ // 6. Return true.
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+ return true;
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+}
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+
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bool Element::id_reference_exists(String const& id_reference) const
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{
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return document().get_element_by_id(id_reference);
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Edwin Hoksberg