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Attributes

All HTML elements can have attributes
Attributes provide additional information about an element
Attributes are always specified in the start tag
Attributes usually come in name/value pairs like: name="value"


Responsive Images

Responsive images are images that scale nicely to fit any browser size.
Using the width Property
If the CSS width property is set to 100%, the image will be responsive and scale up and down:
Notice that in the example above, the image can be scaled up to be larger than its original size. A better solution, in many cases, will be to use the max-width property instead.
Using the max-width Property If the max-width property is set to 100%, the image will scale down if it has to, but never scale up to be larger than its original size 0950934342


Input form* Attributes

This chapter describes the different form* attributes for the HTML form input element.
The form Attribute
The input form attribute specifies the form the input element belongs to.
The value of this attribute must be equal to the id attribute of the form element it belongs to.


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Responsive Web Design

Responsive web design makes your web page look good on all devices. Responsive web design uses only HTML and CSS. Responsive web design is not a program or a JavaScript.


Cards

A card is a flexible and extensible content container. It includes options for headers and footers, a wide variety of content, contextual background colors, and powerful display options. If you’re familiar with Bootstrap 3, cards replace our old panels, wells, and thumbnails. Similar functionality to those components is available as modifier classes for cards. 0950934342


Clearfix

Quickly and easily clear floated content within a container by adding a clearfix utility.


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The text between the audio tags will only be displayed in browsers that do not support the audio element.

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The id Attribute The HTML id attribute is used to specify a unique id for an HTML element (the value must be unique within the HTML document).
Using The id Attribute
The id attribute is used by CSS or JavaScript to perform certain tasks for the element with the specific id value.
In CSS, to select an element with a specific id, write a hash (#) character, followed by the id of the element:

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HTML Iframes An HTML iframe is used to display a web page within a web page.