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I want to know the HTML and CSS version of a website/webapplication ?
By HTML version I assume you mean the doc type. That can be retrieved using the following line of javascript:
console.log(document.doctype);
CSS, however, doesn't have versions in the sense that a version can be declared in the document. Rather, if a style declaration is supported (i.e, the browser can interpret it) then it gets rendered. Terms like CSS3/CSS2.1/Etc are just names we use to describe the state of accepted style declarations in a given generation. They're not bound to some kind of identifiable version that a browser can explicitly detect.
So the short answer is that CSS version is dictated by the styles you include in your stylesheet, and CSS support is dictated by the browser you use to view your website.
Tools like Modernizr will help you detect what your browser does and does not support.
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To make the question short, I was playing with the dom, I created a text-area and noticed that an element tagged lt-mirror was generated whenever the user type something. The new element is placed just before the text-area. Couldn't find any documentation about it across the web ?
The lt-mirror tag was generated by an extension called LanguageTool, which target the text-areas and check for writing errors.
Did some research about this and found something! Okay, so the person who wrote this probably did something called custom elements. Rather than having nested, verbose elements for a page feature, you could use a custom element to make it more comprehensive and most importantly reusable!
You can create a custom element made with your classes, own methods, and properties, etc, and use it with the built-in HTML elements.
You can find more info on it here:
https://javascript.info/custom-elements
https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements
https://developers.google.com/web/fundamentals/web-components/customelements
I guess it's some kind of a custom element.
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Just came across a project that had custom-made tags.
Something like:
<buildings>
<building-1></building-1>
<building-2></building-2>
</buildings>
(This code doesn't do anything; it's an example)
(It's not mine) (https://codepen.io/perbyhring/pen/jpQwav) What is the use of this?
Those custom HTML elements have been introduced some time ago and should make HTML code more readable.
"Those elements provide a way to build own DOM elements but also have some drawbacks as simply defining and using an element called blue-button does not mean that the elements represent a button. Tools such as Web browsers, search engines, or accessibility technology will not automatically treat the resulting element as a button just based on its defined name."
Read more about them in the html standard.
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Okay I'm using Producteev.com frequently on my projects, the other day I noticed that on my workspace page, that the source of the page (Ctrl+U) is quite short and most of the page's items are not in the view source code.
but of course if you inspect the elements of the page you see the actual codes.
I'm not sure if this is the right place to ask such question but I'd like to know why is this happening and using what technology maybe? and also why they do use such techniques?
Viewing the source shows the source code.
Inspecting the DOM shows you a serialisation of the current state of the DOM after the HTML has been parsed, error corrected, normalised and (possibly) manipulated with JavaScript.
DOM elements that have been added dynamically after the page is generated will not be included in the page source.
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What version of the HTML spec was the tag added?
Tables were not in HTML 2 but were in HTML 3.2.
(There were no, non-draft, specifications between those two versions, but HTML 3.0 also included tables.)
HTML 3.2 allows tables for layout but warns that there may be undesired side effects.
can be used to markup tabular material or for layout purposes. Note that the latter role typically causes problems when rending to speech or to text only user agents
HTML 4 removed that option:
should not be used purely as a means to layout document content
… and introduced support for stylesheets. (NB: The "divs vs tables" question is usually better expressed as "stylesheets vs tables").
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I just found that google uses this tag for adsense,
but seems it also works without this tag,why they prefer to use it?
The <ins> tag is used to indicate content that is inserted into a page and indicates changes to a document. According to the HTML spec this was intended primarily for use in marking up versioning of a document.
Clients that aware of this tag may choose to display content inside this tag differently or not at all depending on what they are designed to do. This is very much semantic HTML
As for why Google decide to use it I couldn't say
INS is semantic tag describing something that is inserted to the text after the text was already published. It is not a big deal, it is I guess used by their robots to understand something they care about.
Adding semantics to markup allows tools to extract more meta data from them. Google is in the business of writing such tools, so has good reason to encourage the use of code that they can use.