Category: Charset utf-8

15.04.2021

Charset utf-8

By Aralrajas

Unicode is a standard encoding system for computers to display text and symbols from all writing systems around the world.

Character encodings in HTML

On the Unicode website you can read the following definition for Unicode: Unicode provides a unique number for every character, no matter what the platform, no matter what the program, no matter what the language. View the conversion routines. You can use. Apache's default character set is ISO Apache will use this character set in the HTTP header it sends back to the browser after a request. To serve just your.

You can also create a new extension index. You must use this function before any output is sent to the browser. Both versions will work in HTML5. The long version will overrule the short one and HTTP headers will overrule both. Browsers might ignore this statement if your document has a BOM-header see below. BOM-headers might give problems with some scripting languages such as PHP you will see some strange characters -the BOM header- flashing for a fraction of a second before a page is loaded.

Pages Home. Epoch Converter. Home - Privacy - Disclaimer - Contact - Twitter. Jump to top.The utf8mb3 character set is deprecated and will be removed in a future MySQL release. Please use utf8mb4 instead. Although utf8 is currently an alias for utf8mb3at some point utf8 will become a reference to utf8mb4. To avoid ambiguity about the meaning of utf8consider specifying utf8mb4 explicitly for character set references instead of utf8.

charset utf-8

Character Sets and Collations in General. Specifying Character Sets and Collations. Collation Naming Conventions. Server Character Set and Collation. Database Character Set and Collation. Table Character Set and Collation. Column Character Set and Collation. Examples of Character Set and Collation Assignment. Connection Character Sets and Collations. Configuring Application Character Set and Collation.

Column Character Set Conversion. Character Set and Collation Compatibility. Collation Coercibility in Expressions. Examples of the Effect of Collation. The utf8 Character Set Alias for utf8mb3. Supported Character Sets and Collations.The charset CSS at-rule specifies the character encoding used in the style sheet.

It must be the first element in the style sheet and not be preceded by any character; as it is not a nested statementit cannot be used inside conditional group at-rules. If several charset at-rules are defined, only the first one is used, and it cannot be used inside a style attribute on an HTML element or inside the element contains style information for a document, or part of a document.

As there are several ways to define the character encoding of a style sheet, the browser will try the following methods in the following order and stop as soon as one yields a result :. Get the latest and greatest from MDN delivered straight to your inbox. Sign in to enjoy the benefits of an MDN account. The compatibility table on this page is generated from structured data. Last modified: Mar 23,by MDN contributors. Related Topics. Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox.

The newsletter is offered in English only at the moment. Sign up now. Sign in with Github Sign in with Google. Chrome Full support 2. Edge Full support Firefox Full support 1. IE Full support 5.

Opera Full support 9. Safari Full support 4. WebView Android Full support 2. Chrome Android Full support Firefox Android Full support 4. Opera Android Full support Safari iOS Full support 4.

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Samsung Internet Android Full support 1.If you don't, you risk that characters in your content are incorrectly interpreted. This is not just an issue of human readability, increasingly machines need to understand your data too. 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.

This article describes how to do this for an HTML file. If you need to better understand what characters and character encodings are, see the article Character encodings for beginners.

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Always declare the encoding of your document using a meta element with a charset attribute, or using the http-equiv and content attributes called a pragma directive. The declaration should fit completely within the first bytes at the start of the file, so it's best to put it immediately after the opening head tag. It doesn't matter which you use, but it's easier to type the first one.

It also doesn't matter whether you type UTF-8 or utf You should always use the UTF-8 character encoding. Remember that this means you also need to save your content as UTF See what you should consider if you really cannot use UTF If you have access to the server settings, you should also consider whether it makes sense to use the HTTP header.

Characters in a computer - Unicode Tutorial UTF-8 (3/3)

Note however that, since the HTTP header has a higher precedence than the in-document meta declarations, content authors should always take into account whether the character encoding is already declared in the HTTP header.

If it is, the meta element must be set to declare the same encoding. It has a higher precedence than any other declaration, including the HTTP header. You could skip the meta encoding declaration if you have a BOM, but we recommend that you keep it, since it helps people looking at the source code to ascertain what the encoding of the page is.

Read more about the byte-order mark. Use character encoding declarations in HTTP headers if it makes sense, and if you are able, for any type of content, but in conjunction with an in-document declaration. Content authors should always ensure that HTTP declarations are consistent with the in-document declarations.

It may be difficult for content authors to change the encoding information for static files on the server — especially when dealing with an ISP. Authors will need knowledge of and access to the server settings. Server settings may get out of synchronization with the document for one reason or another. This may happen, for example, if you rely on the server default, and that default is changed.

This is a very bad situation, since the higher precedence of the HTTP information versus the in-document declaration may cause the document to become unreadable. There are potential problems for both static and dynamic documents if they are not read from a server; for example, if they are saved to a location such as a CD or hard disk.

In these cases any encoding information from an HTTP header is not available. 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. If serving files via HTTP from a server, it is never a problem to send information about the character encoding of the document in the HTTP header, as long as that information is correct.

On the other hand, because of the disadvantages listed above we recommend that you should always declare the encoding information inside the document as well. An in-document declaration also helps developers, testers, or translation production managers who want to visually check the encoding of a document.

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Some people would argue that it is rarely appropriate to declare the encoding in the HTTP header if you are going to repeat it in the content of the document. In this case, they are proposing that the HTTP header say nothing about the document encoding. Note that this would usually mean taking action to disable any server defaults. XML parsers do not recognise the encoding declarations in meta elements.

They only recognise the XML declaration. Here is an example:. The XML declaration is only required if the page is not being served as UTF-8 or UTFbut 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.

On the other hand, if the file is to be read as HTML you will need to declare the encoding using a meta element, the byte-order mark or the HTTP header.

If you use the meta element with a charset attribute this is not something you need to consider.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I've been seeing this instruction as the very first line of numerous CSS files that have been turned over to me:. Also, if I include this meta tag in my "head" element, would that eliminate the need to have it also present within my CSS files?

It tells the browser to read the css file as UTF This is useful in contexts where the encoding is not told per HTTP header or other meta data, e. Unfortunately, you cannot rely on this mechanism as the support is rather … rare. And remember that on the net an HTTP header will always override the charset rule. The correct rules to determine the character set of a stylesheet are in order of priority:. The last rule is the weakest, it will fail in some browsers.

Watch out for conflict between the different declarations. They are not easy to debug. One reason to always include a character set specification on every page containing text is to avoid cross site scripting vulnerabilities. You could conceivably have completely different encodings for your html and css, although I can't imagine this would be a good idea. Learn more. Ask Question. Asked 10 years, 3 months ago.

charset utf-8

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UTF-8 encoding table and Unicode characters

I've been seeing this instruction as the very first line of numerous CSS files that have been turned over to me: charset "UTF-8"; What does it do, and is this at-rule necessary?

Active Oldest Votes. Using it in the meta tag is fine, but only for pages that include that meta tag. Kevin 40k 12 12 gold badges 44 44 silver badges 62 62 bronze badges.

Complete Character List for UTF-8

Oded Oded k 82 82 gold badges silver badges bronze badges. The correct rules to determine the character set of a stylesheet are in order of priority: HTTP Charset header.

Byte Order Mark. The first charset rule. Recommended reading Russ Rolfe: Declaring character encodings in CSS IANA: Official names for character sets — other names are not allowed; use the preferred name for charset if more than one name is registered for the same encoding.

MDN: charset. There is a support table. I do not trust this. I mean isn't it already implied that without a charset, the charset of the css file should be interpreted as the same as that of the embedding HTML file? Pacerier I observed this isn't always the case. Sign up or log in Sign up using Google.

charset utf-8

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.It is an octet 8-bit lossless encoding of Unicode characters. Lawrie Dalman Consulting is an IT service provider. I was hoping to get a shot at what I thought you'd follow up with, that first question is a leading question if I ever saw one, but yes the responses are volumous.

I'll look forward to seeing your next query once you soak up what you have at your mouse click. Even if I'm asleep and don't get to offer an answer. Thanks for your response.

What I need to know is, do I have to change something on my end, or does the client have to accept a certain type of header? When the response comes back as :. Well, I don't really know. Data is sent from us to an affiliate, if data confirms reciept of delivery it returns a value of Ok, if not it will return an error message.

That is one of the messages I receive. Could you please expand on what log file you are referring to what produced it? If this parameter is not given, Internet Explorer uses the character set specified by the meta element in the document. A document designed under UTF-8 will look good when open directly file: but won't if the server serves it as ISO or Windows It assumes the file is in UTF-8 and refuses to render it if it is not.

I would gather that the Redirect is where the header is being malformed meaning the solution might be beyond the scope of your position and the point of redirect will need to be contacted and the situation reported. To continue this discussion, please ask a new question.

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Get answers from your peers along with millions of IT pros who visit Spiceworks. Best Answer. Twisted Twin This person is a verified professional. Verify your account to enable IT peers to see that you are a professional. These should shed more light on the understanding in Web Development and Scripting. Popular Topics in Web Hosting. Which of the following retains the information it's storing when the system power is turned off? Curtis This person is a verified professional.

Ghost Chili. Lawrie This person is a verified professional. Did or was that going to lead to another question? Bianca Mar 10, at UTC. Sure did, now I just have to finish reading all those pages!!

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Bianca wrote: Sure did, now I just have to finish reading all those pages!! Well it depends on where you are seeing it, on your server?? Are you hosting the website? Bianca, Could you please expand on what log file you are referring to what produced it? This topic has been locked by an administrator and is no longer open for commenting. Read these nextWhen an HTML document includes special characters outside the range of seven-bit ASCIItwo goals are worth considering: the information's integrityand universal browser display.

There are several ways to specify which character encoding is used in the document. First, the web server can include the character encoding or " charset " in the Hypertext Transfer Protocol HTTP Content-Type header, which would typically look like this: [1]. For HTML it is possible to include this information inside the head element near the top of the document: [3].

HTML5 also allows the following syntax to mean exactly the same: [3]. As the character encoding cannot be known until this [ clarification needed ] declaration is parsed, there can be a problem knowing which encoding is used for the declaration itself. In order to allow encodings not backwards compatible with ASCII, browsers must be able to parse declarations in such encodings.

This presents few problems for English -speaking users, but other languages regularly—in some cases, always—require characters outside that range. In CJK environments where there are several different multi-byte encodings in use, auto-detection is also often employed.

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Finally, browsers usually permit the user to override incorrect charset label manually as well. It is increasingly common for multilingual websites and websites in non-Western languages to use UTF-8which allows use of the same encoding for all languages.

Successful viewing of a page is not necessarily an indication that its encoding is specified correctly.

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If the page's creator and reader are both assuming some platform-specific character encoding, and the server does not send any identifying information, then the reader will nonetheless see the page as the creator intended, but other readers on different platforms or with different native languages will not see the page as intended.

In addition to native character encodings, characters can also be encoded as character referenceswhich can be numeric character references decimal or hexadecimal or character entity references. The x must be lowercase in XML documents. The nnnn or hhhh may be any number of digits and may include leading zeros. The hhhh may mix uppercase and lowercase, though uppercase is the usual style. Most modern software is able to display most or all of the characters for the user's language, and will draw a box or other clear indicator for characters they cannot render.

For codes from 0 tothe original 7-bit ASCII standard set, most of these characters can be used without a character reference. Codes from to can all be created using character entity names. Only a few higher-numbered codes can be created using entity names, but all can be created by decimal number character reference. If the character encoding for a web page is chosen appropriately, then HTML character references are usually only required for markup delimiting characters as mentioned above, and for a few special characters or none at all if a native Unicode encoding like UTF-8 is used.

Incorrect HTML entity escaping may also open up security vulnerabilities for injection attacks such as cross-site scripting.