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28 de out. de 2014 · These are generally old obsolete features that have no effect, and are allowed only to distinguish between likely mistakes (regular conformance errors) and mere vestigial markup or unusual and discouraged practices (these warnings).
8 de jun. de 2023 · As tags obsoletas do HTML5 são aquelas que não são mais suportadas pelos navegadores modernos e, portanto, devem ser evitadas. Essas tags podem causar problemas de compatibilidade e podem fazer com que o seu site pareça desatualizado.
Learn what deprecated HTML tags mean and see a list of them with their alternatives. Find out which HTML tags are obsolete and should not be used in HTML 5.
28 de jan. de 2021 · Obsolete features. 11.1. Obsolete but conforming features. Features listed in this section will trigger warnings in conformance checkers. Authors should not specify a border attribute on an img element. If the attribute is present, its value must be the string " 0 ". CSS should be used instead.
- Features Already Deprecated #
- Elements Back from The Dead #
- Old Monolithic Doctypes #
- Frames #
- The Type Attribute For Scripts and Stylesheets #
- The Acronym Element #
- The Bgsound Element #
- The TT Element #
- The Nobr Element #
- The Blink and Marquee Elements #
The following elements were deprecated in HTML 4: 1. 2. 3. 4. 5. 6. 7. 8. Furthermore, various presentational attributes like bgcolor, border and align are deprecated and should be achieved using CSS instead. Appropriate replacements can be found in our previous article.
As well as deprecating features, some elements have also been repurposed in HTML 5. 1. - bold text - now represents ‘a span of text to which attention is being drawn without conveying any extra importance’. Examples include key words or product names. 2. - citation - now represents ‘the title of a work’ only and not a person. Examples incl...
All web pages should start with a valid ‘doctype’. Prior to HTML5 we had many different doctypes for different levels of standards support: Instead, the doctype for all web pages should now be: This is supported by all browsers, without any issues or quirks. It’s also very easy to remember!
Frames were an interesting feature in the early days of HTML. As most websites have a common header or sidebar menu, downloading that on every page you visited could be slow on older connections. For developers, having to update the menu across every page was tedious. Frames allowed you to put your menu in one HTML file and each content page of the...
Ever since stylesheets and scripting were introduced, browsers have only ever supported CSS and JavaScript respectively (although in the case of JS there were many small differences between Internet Explorer and Netscape). As such, all appropriate elements default to CSS of JavaScript, so there is no need to specify the typeattribute. Instead of: W...
In HTML 4 two elements and were defined, for abbreviations and acronyms respectively. However, the difference between the tags was a little muddled and in fact there isn’t any reason to distinguish between the tags. Since an acronym is a type of abbreviation, from HTML 5 only the tag is acceptable. Here’s an example of usage:
This was an old element only supported by Internet Explorer, which played an audio file when the web page was loaded: Auto-playing music is heavily discouraged on websites, but HTML 5 defines a new element that can be used if so desired: The controls attribute adds standard play/pause controls, while loop makes the audio repeat infinitely. T...
was used to style text as ‘teletype’ (monospaced). It should be replaced by a more appropriate element: 1. for computer code 2. for keyboard input 3. for sample computer output 4. for variables 5. for a block of pre-formatted text The , , and elements are displayed in monospace font by default, while...
This is another proprietary element, however this one is actually well-supported. It simply prevents any line breaks from occurring inside the tag: The tag should be replaced with the CSS white-spaceproperty.
These were never standard elements (they were introduced by Netscape in the 1990s), but are noted in the HTML 5 spec as obsolete. The tag caused an element’s visibility to toggle on and off repeatedly. The tag caused text to scroll across the screen, like an electronic banner. Both elements have been considered to be bad practice f...
12 de nov. de 2014 · Learn about five elements, attributes, and APIs that have been removed or changed in the HTML5 specification. Find out the difference between obsolete and deprecated features and how to use alternatives.
Saiba quais são as tags e atributos que foram substituídos ou abolidos na evolução do HTML, e por que isso aconteceu. Veja exemplos, alternativas e dicas para evitar usar elementos obsoletos na web.
