Jason Aller 3, 28 28 gold badges 39 39 silver badges 37 37 bronze badges. Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast what if you could invest in your favorite developer? Who owns this outage? Building intelligent escalation chains for modern SRE. Featured on Meta. In the second example, we use strict dtd in html 4 version so it will accept the particular tags and elements; it will not be allowed to use the deprecated tag elements in the second example, but in the last example, we use the frameset dtd in the html documents it allows the deprecated elements as well as whatever we use the html 4 transitional dtd elements and also will include the frameset tag elements.
In html will use DOCTYPE as a better choice for creating the web-based applications, and also it will be helpful for the website users browsers that the document is related to the html based documents. If we suppose will not use the html tag elements in the inside of the document that should be with the DOCTYPE declaration, it must be must with the html standards with the help of web browsers, and templates will check the html standards.
You may also have a look at the following articles to learn more —. Submit Next Question. Kind of. It's typically because of the. That leads browsers to decide that they received a regular HTML document, and so that tag soup parsing nonsense we've all come to know and love inevitably ensues.
Most people use the XHTML doctype because they read it in an old book somewhere or read it on a forum but otherwise are using it for no technical reason they are aware of. It should not be done but browsers generally handle it well. But they don't - thry serve them as HTML. Since the two languages are so much alike, people rarely notice the difference.
So no, you're not missing anything; it's very bad practice. Nowadays, after HTML5, luckily, it seems to become less common. People who add the XML prolog before the doctype are doing themselves an extra disservice, as a comment before the doctype will cause old IE to use quirks mode, which among other things brings back the old box-model in IE6 and below. This undoubtedly has contributed to the mass hate of IE6, as in quirks mode it has significant bugs that cause modern layouts to be completely broken, rather than just lacking in newer features.
The short answer is that in this industry many people just copy and paste code without understanding it. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What does that do? Ask Question. Differential Continuity equation.
Differential Energy equation. Differential Momentum equation. Dimensional Analysis. Laminar flow. Turbulent flow. Lift and Drag. Boundary layer theory. It follows the notation of the HTML 4. All rights reserved.
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