Is necessary to use an ID to all html elements? [closed] - html

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As a HTML5 beginner, I would like to know if it is necessary to use an ID for all html elements I use ?

No, you only need to use an ID if you want to target that element or its children for style or script purposes.

No.
You might need to use it,when you need to work with it like ->
To link to an element with a specified id within a page
To style text with CSS

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How does Grammerly partially style the input texts that are wrong? [closed]

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I want to style the user input dynamically based on certain validation conditions.
After doing research online it appears that css styling applied within the input either has to be applied to the entire input search box.
I want to have an end result that looks like this where the error/invalid text has a special styling to highlight them dynamically. Please help!

HTML, what element is this one? [closed]

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I tried finding which element/tag is this one but I couldn't find it anywhere.
See the screenshot:
It appears to be range tag:link
Looks like a jQuery UI element rather than an HTML element.
See this link for more details : JQueryUI Slider

How to change the images using HTML and CSS? [closed]

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I don't know whether this question make sense . But i have this doubt .. please clear my doubt
For assumption , i have 5 images ,Is this possible to change 5 images one by one [like slider] using HTML and CSS styles without using jquery and javascript
Yes it is possible. A quick google search took me to this working example with code:
CSS Slider

User formatting for textarea [closed]

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A perfect example is stackoverflow. When a user types a question, the textarea give the user basic formatting options such as bullet points, numbering, italicize, etc. How can I create a similar textarea? I am currently using html, css and php.
You can use javascript (or more effectively jQuery) to create your own textarea with this behaviour, or look at an existing package such as TinyMCE and configure it to meet your requirements (the approach I would suggest): http://www.tinymce.com/
Easiest way would be to use an editor like TinyMCE: http://www.tinymce.com/
There are others as well, but TinyMCE is what I see used most.

Customizing ebay store HTML and CSS code (How to?) [closed]

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I have an ebay store and it has some themes but I would like to be able to change the CSS and HTML code myself.
Does anyone know how this is done?
Thanks
I've done it several times earlier. Main thing is to add link to stylesheet (which is on your server). If i remember correct, you can add it where HTML for header is added, and then style elements generated by eBay. (Don't use id)