html head
Das W3C hat bereits in der Spezifikation von HTML 4.01 das rel-Attribut ausdrücklich für die Nutzung durch Suchmaschinen vorgesehen. XHTML 1.x served as text/html: Also needs the pragma directive for full conformance with HTML 4.01, rather than the charset attribute. 検索エンジンに対して「このページをインデックス(掲載)しないで!」という指示をします。インデックス・クロール共に普通にしてもらいたい場合には、何も書かなければOKです。content="index,follow"と書いても、意味はありません。, 重要 facebookやtwitterなどのソーシャルメディアでシェアされたときに、リンクを魅力的に表示させるための設定です。ソーシャルメディアからの流入を伸ばすために必須です。, 推奨 SEO対策 SEO的にも重要なlinkタグです。複数の内容が重複するページが生まれてしまった場合に、検索エンジンからのページ評価が分散してしまうのを防ぐことができます。 Ausnahme in HTML5 . ), Web project managers, and anyone who needs an introduction to how to declare the character encoding of their HTML file. titleタグ内で指定したテキストは、検索結果やブラウザのタブに表示されます(検索結果では反映されない場合もありますが)。また、必ず書いておくようにしましょう。人気のブログサービス(WordPress、はてなブログ、アメブロなどなど)では、まず間違いなく自動出力されるようになっています。, 推奨 ページの内容を表す文章を100字以下程度で書きます。このタグで指定した文章は、検索結果のタイトル下に表示されます(されない場合もあります)。そのため、ユーザーのクリック率を高めるために重要です。 You can detect any encodings sent by the HTTP header using the Internationalization Checker.
It is not clear that this transcoding is much used nowadays. It describes any differences from the Answer section above. Also, when printing a large table that spans …
taking action to disable any server defaults.). ただし、メタデスクリプションを書いたからと言って、直接的な検索順位上昇効果はありません。検索ユーザーのために書くようにしましょう。, 重要 SEO対策 The byte-order mark at the beginning of your file will indicate whether the encoding scheme is little-endian or big-endian. HTML文書では、
、の3種類のタグで文書の構造を定義します。 html ~はその文書がHTML文書であることを宣言するタグであり、 文書の最初と最後に記述します。 ~の間には、文書 Tip: Go to our CSS Navbar Tutorial to learn more about navigation bars. 人気のブログサービス(WordPress、はてなブログ、アメブロなどなど)では、まず間違いなく自動出力されるようになっています。, , , , . if the encoding is declared in any other way, this will be ignored).The information in this section relates to things you should not normally need to know, but which are included here for completeness.
In HTML5 darf das title-Element fehlen, falls der Titel des Dokuments aus einem höheren Zusammenhang ermittelbar ist; bei der Verwendung von HTML in E-Mails könnte dies zum Beispiel die Betreffzeile der E-Mail sein. Polyglot markup: A page that uses polyglot markup uses a subset of HTML with XML syntax that can be parsed either by an HTML or an XML parser. Similarly, if the character encoding is only declared in the HTTP header, this information is no longer available for files during editing, or when they are processed by such things as XSLT or scripts, or when they are sent for translation, etc.
It originated in the HTML 4.01 specification for use with the a, link and script elements and was supposed to indicate the encoding of the document you are linking to. A character encoding declaration is also needed to process non-ASCII characters entered by the user in forms, in URLs generated by scripts, and so forth. Ensure there is nothing before it, including spaces (although a byte-order mark is OK).
The declaration should fit completely within the first 1024 bytes at the start of the file, so it's best to put it immediately after the opening head tag.
servers that transcode the data (ie.
要素 (これは body コンテンツの最上位レベルの見出し(head)を追加します — 時々ページタイトルとしても参照されます) と混同されます。しかしこれらは別のものです!
Note, however, that the presence of a name in either of these sources doesn't necessarily mean that it is OK to use that encoding. This is a very bad situation, since the higher precedence of the HTTP information versus the Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Learn how to create a responsive header with CSS.
One advantage of using the HTTP header is that user agents can find the character encoding information sooner when it is sent in the HTTP header. XML.
On the other hand, there are a number of potential disadvantages: It may be difficult for content authors to change the encoding information for static files on the server – especially when dealing with an ISP. CSS HTML文書では、
、Change the design of the header depending on the screen size. Introducing Character Sets and Encodings, Tutorial, Handling character encodings in HTML and CSS. Tip: The ,
, and elements will not affect theHere is an example: The XML declaration is only required if the page is not being served as UTF-8 (or UTF-16), but it can be useful to include it so that developers, testers, or translation production managers can visually check the encoding of a document by looking at the source. Do not invent your own encoding names preceded by x-.
XML. This is not just an issue of human readability, increasingly machines need to understand your data too.
The new Encoding specification now provides a list that has been tested against actual browser implementations.
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