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HTMLAnchorElement: host プロパティ - Web API | MDN

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.

HTMLAnchorElement.host プロパティは、ホストを含む文字列です。すなわち、ホスト名の後に、 URL のポートが空でない場合は、':'、および URL のポートが続きます。

値

文字列です。

例

js

const anchor = document.createElement("a");

anchor.href = "https://developer.mozilla.org/ja/HTMLAnchorElement";
anchor.host === "developer.mozilla.org";

anchor.href = "https://developer.mozilla.org:443/ja/HTMLAnchorElement";
anchor.host === "developer.mozilla.org";
// The port number is not included because 443 is the scheme's default port

anchor.href = "https://developer.mozilla.org:4097/ja/HTMLAnchorElement";
anchor.host === "developer.mozilla.org:4097";

仕様書

Specification
HTML
# dom-hyperlink-host-dev

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