String AccessibilityMathMLElement::stringValue() const
{
if (m_isAnonymousOperator)
return textUnderElement();
return AccessibilityRenderObject::stringValue();
}
String AccessibilitySVGElement::accessibilityDescription() const
{
// According to the SVG Accessibility API Mappings spec, the order of priority is:
// 1. aria-labelledby
// 2. aria-label
// 3. a direct child title element (selected according to language)
// 4. xlink:title attribute
// 5. for a use element, the accessible name calculated for the re-used content
// 6. for text container elements, the text content
String ariaDescription = ariaAccessibilityDescription();
if (!ariaDescription.isEmpty())
return ariaDescription;
auto titleElements = childrenOfType<SVGTitleElement>(*element());
if (auto titleChild = childElementWithMatchingLanguage(titleElements))
return titleChild->textContent();
if (is<SVGAElement>(element())) {
auto& xlinkTitle = element()->attributeWithoutSynchronization(XLinkNames::titleAttr);
if (!xlinkTitle.isEmpty())
return xlinkTitle;
}
if (m_renderer->isSVGText()) {
AccessibilityTextUnderElementMode mode;
String text = textUnderElement(mode);
if (!text.isEmpty())
return text;
}
if (is<SVGUseElement>(element())) {
if (AccessibilityObject* target = targetForUseElement())
return target->accessibilityDescription();
}
// FIXME: This is here to not break the svg-image.html test. But 'alt' is not
// listed as a supported attribute of the 'image' element in the SVG spec:
// https://www.w3.org/TR/SVG/struct.html#ImageElement
if (m_renderer->isSVGImage()) {
const AtomicString& alt = getAttribute(HTMLNames::altAttr);
if (!alt.isNull())
return alt;
}
return String();
}
unsigned AccessibilityObject::getLengthForTextRange() const
{
unsigned textLength = text().length();
if (textLength)
return textLength;
// Gtk ATs need this for all text objects; not just text controls.
Node* node = this->node();
RenderObject* renderer = node ? node->renderer() : 0;
if (renderer && renderer->isText())
textLength = toRenderText(*renderer).textLength();
// Get the text length from the elements under the
// accessibility object if the value is still zero.
if (!textLength && allowsTextRanges())
textLength = textUnderElement(AccessibilityTextUnderElementMode(AccessibilityTextUnderElementMode::TextUnderElementModeIncludeAllChildren)).length();
return textLength;
}
String AccessibilitySVGElement::helpText() const
{
// According to the SVG Accessibility API Mappings spec, the order of priority is:
// 1. aria-describedby
// 2. a direct child desc element
// 3. for a use element, the accessible description calculated for the re-used content
// 4. for text container elements, the text content, if not used for the name
// 5. a direct child title element that provides a tooltip, if not used for the name
String describedBy = ariaDescribedByAttribute();
if (!describedBy.isEmpty())
return describedBy;
auto descriptionElements = childrenOfType<SVGDescElement>(*element());
if (auto descriptionChild = childElementWithMatchingLanguage(descriptionElements))
return descriptionChild->textContent();
if (is<SVGUseElement>(element())) {
AccessibilityObject* target = targetForUseElement();
if (target)
return target->helpText();
}
String description = accessibilityDescription();
if (m_renderer->isSVGText()) {
AccessibilityTextUnderElementMode mode;
String text = textUnderElement(mode);
if (!text.isEmpty() && text != description)
return text;
}
auto titleElements = childrenOfType<SVGTitleElement>(*element());
if (auto titleChild = childElementWithMatchingLanguage(titleElements)) {
if (titleChild->textContent() != description)
return titleChild->textContent();
}
return String();
}
