HTML <iframe> 标签
使用 <iframe> 标签 在当前 HTML 文档中嵌入另一个文档：
<!DOCTYPE html>
<html>
<body><h1>iframe 元素</h1><iframe src="https://www.w3school.com.cn" title="W3School 在线教程">
</iframe></body>
</html>1、<iframe> 在html_tag_names.json5中接口定义：
（third_party\blink\renderer\core\html\html_tag_names.json5）
{name: "iframe",interfaceName: "HTMLIFrameElement",},2、html_iframe_element.idl接口定义：
third_party\blink\renderer\core\html\html_iframe_element.idl
// https://html.spec.whatwg.org/multipage/iframe-embed-object.html#htmliframeelement// The `HTMLString` references below are from Trusted Types:
// https://github.com/w3c/trusted-types/, which is still WIP.
// https://crbug.com/739170.
[Exposed=Window,HTMLConstructor
] interface HTMLIFrameElement : HTMLElement {[CEReactions, Reflect, URL] attribute USVString src;[CEReactions, Reflect, RaisesException=Setter] attribute HTMLString srcdoc;[CEReactions, Reflect] attribute DOMString name;[PutForwards=value] readonly attribute DOMTokenList sandbox;// Note: The seamless attribute was once supported, but was removed.[CEReactions, Reflect] attribute boolean allowFullscreen;[CEReactions, Reflect] attribute DOMString width;[CEReactions, Reflect] attribute DOMString height;[CheckSecurity=ReturnValue] readonly attribute Document? contentDocument;readonly attribute Window? contentWindow;[CheckSecurity=ReturnValue, RaisesException] Document? getSVGDocument();[CEReactions, Reflect, ReflectOnly=("","no-referrer","origin","no-referrer-when-downgrade","origin-when-cross-origin","unsafe-url"), ReflectMissing="", ReflectInvalid=""] attribute DOMString referrerPolicy;// https://w3c.github.io/webappsec-csp/embedded/#dom-htmliframeelement-csp[CEReactions, Reflect] attribute DOMString csp;// Feature Policy[CEReactions, Reflect] attribute DOMString allow;// https://w3c.github.io/webappsec-feature-policy/#the-policy-objectreadonly attribute FeaturePolicy featurePolicy;// Document Policy[RuntimeEnabled=DocumentPolicyNegotiation, CEReactions, Reflect] attribute DOMString policy;[CEReactions, Reflect, ReflectOnly=("lazy", "eager", "auto"), ReflectMissing="auto", ReflectInvalid="auto"] attribute DOMString loading;// Trust Tokens request parameters (https://github.com/wicg/trust-token-api)[RuntimeEnabled=PrivateStateTokens, SecureContext, Reflect, MeasureAs=TrustTokenIframe] attribute DOMString privateToken;// Topics API (https://github.com/patcg-individual-drafts/topics)[RuntimeEnabled=TopicsAPI, SecureContext, CEReactions, Reflect] attribute boolean browsingTopics;// Protected Audience (https://wicg.github.io/turtledove)[RuntimeEnabled=FledgeNegativeTargeting, SecureContext, CEReactions, Reflect] attribute boolean adAuctionHeaders;// Iframes credentialless// https://github.com/WICG/anonymous-iframe[CEReactions, Reflect, RuntimeEnabled=AnonymousIframe] attribute boolean credentialless;// obsolete members// https://html.spec.whatwg.org/C/#HTMLIFrameElement-partial[CEReactions, Reflect] attribute DOMString align;[CEReactions, Reflect] attribute DOMString scrolling;[CEReactions, Reflect] attribute DOMString frameBorder;[CEReactions, Reflect, URL] attribute USVString longDesc;[CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginHeight;[CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginWidth;
};// Shared Storage API (https://github.com/WICG/shared-storage#from-response-headers)
HTMLIFrameElement includes HTMLSharedStorageWritableElementUtils;
3、html_iframe_element.idl在 bink接口定义：
third_party\blink\renderer\core\html\html_iframe_element.h
third_party\blink\renderer\core\html\html_iframe_element.cc
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_IFRAME_ELEMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_IFRAME_ELEMENT_H_#include "services/network/public/mojom/trust_tokens.mojom-blink-forward.h"
#include "services/network/public/mojom/web_sandbox_flags.mojom-blink.h"
#include "third_party/blink/public/common/permissions_policy/permissions_policy.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/html/html_frame_element_base.h"
#include "third_party/blink/renderer/core/html/html_iframe_element_sandbox.h"
#include "third_party/blink/renderer/platform/supplementable.h"namespace blink {
class DOMFeaturePolicy;class CORE_EXPORT HTMLIFrameElement : public HTMLFrameElementBase,public Supplementable<HTMLIFrameElement> {DEFINE_WRAPPERTYPEINFO();public:void Trace(Visitor*) const override;explicit HTMLIFrameElement(Document&);~HTMLIFrameElement() override;DOMTokenList* sandbox() const;// Support JS introspection of frame policy (e.g. permissions policy)DOMFeaturePolicy* featurePolicy();// Returns attributes that should be checked against Trusted Typesconst AttrNameToTrustedType& GetCheckedAttributeTypes() const override;ParsedPermissionsPolicy ConstructContainerPolicy() const override;DocumentPolicyFeatureState ConstructRequiredPolicy() const override;FrameOwnerElementType OwnerType() const final {return FrameOwnerElementType::kIframe;}bool Credentialless() const override { return credentialless_; }private:void SetCollapsed(bool) override;void ParseAttribute(const AttributeModificationParams&) override;bool IsPresentationAttribute(const QualifiedName&) const override;void CollectStyleForPresentationAttribute(const QualifiedName&,const AtomicString&,MutableCSSPropertyValueSet*) override;InsertionNotificationRequest InsertedInto(ContainerNode&) override;void RemovedFrom(ContainerNode&) override;bool LayoutObjectIsNeeded(const DisplayStyle&) const override;LayoutObject* CreateLayoutObject(const ComputedStyle&) override;bool IsInteractiveContent() const override;network::mojom::ReferrerPolicy ReferrerPolicyAttribute() override;network::mojom::blink::TrustTokenParamsPtr ConstructTrustTokenParams()const override;// FrameOwner overrides:bool AllowFullscreen() const override { return allow_fullscreen_; }bool AllowPaymentRequest() const override { return allow_payment_request_; }// HTML attributes of the iframe element that need to be tracked by the// browser changed, such as 'id' and 'src'. This will send an IPC to the// browser about the updates.void DidChangeAttributes() override;AtomicString name_;AtomicString required_csp_;AtomicString allow_;AtomicString required_policy_; // policy attributeAtomicString id_;AtomicString src_;// String attribute storing a JSON representation of the Trust Token// parameters (in order to align with the fetch interface to the Trust Token// API). If present, this is parsed in ConstructTrustTokenParams.AtomicString trust_token_;bool allow_fullscreen_;bool allow_payment_request_;bool collapsed_by_client_;bool credentialless_ = false;Member<HTMLIFrameElementSandbox> sandbox_;Member<DOMFeaturePolicy> policy_;network::mojom::ReferrerPolicy referrer_policy_;
};} // namespace blink#endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_HTML_IFRAME_ELEMENT_H_
4、html_iframe_element.idl在 v8接口定义：
out\Debug\gen\third_party\blink\renderer\bindings\core\v8\v8_html_iframe_element.h
out\Debug\gen\third_party\blink\renderer\bindings\core\v8\v8_html_iframe_element.cc
截取部分实现：
v8::Local<v8::FunctionTemplate> interface_function_template = interface_template.As<v8::FunctionTemplate>();
v8::Local<v8::Signature> signature = v8::Signature::New(isolate, interface_function_template);
{static const IDLMemberInstaller::AttributeConfig kAttributeTable[] = {
{"alt", AltAttributeGetCallback, AltAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"src", SrcAttributeGetCallback, SrcAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"srcset", SrcsetAttributeGetCallback, SrcsetAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"sizes", SizesAttributeGetCallback, SizesAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"crossOrigin", CrossOriginAttributeGetCallback, CrossOriginAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"useMap", UseMapAttributeGetCallback, UseMapAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"isMap", IsMapAttributeGetCallback, IsMapAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"width", WidthAttributeGetCallback, WidthAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"height", HeightAttributeGetCallback, HeightAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"naturalWidth", NaturalWidthAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"naturalHeight", NaturalHeightAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"complete", CompleteAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"currentSrc", CurrentSrcAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"referrerPolicy", ReferrerPolicyAttributeGetCallback, ReferrerPolicyAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"decoding", DecodingAttributeGetCallback, DecodingAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"fetchPriority", FetchPriorityAttributeGetCallback, FetchPriorityAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"loading", LoadingAttributeGetCallback, LoadingAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"name", NameAttributeGetCallback, NameAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"lowsrc", LowsrcAttributeGetCallback, LowsrcAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"align", AlignAttributeGetCallback, AlignAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"hspace", HspaceAttributeGetCallback, HspaceAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"vspace", VspaceAttributeGetCallback, VspaceAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"longDesc", LongDescAttributeGetCallback, LongDescAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"border", BorderAttributeGetCallback, BorderAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"x", XAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"y", YAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
};
IDLMemberInstaller::InstallAttributes(isolate, world, instance_template, prototype_template, interface_template, signature, kAttributeTable);
}
