HTML links are defined with the
<a> tag. The link address is specified in the
You will learn more about links and the
<a> tag later in this tutorial.
HTML images are defined with the
The filename of the image source is specified in the
Images in HTML have a set of size attributes, which specifies the width and height of the image:
The image size is specified in pixels: width="500" means 500 pixels wide.
alt attribute specifies an alternative text to be used, when an image cannot be displayed.
The value of the attribute can be read by screen readers. This way, someone "listening" to the webpage, e.g. a vision impaired person, can "hear" the element.
alt attribute is also useful if the image does not exist:
See what happens if we try to display an image that does not exist:
style attribute is used to specify the styling of an element, like color, font, size etc.
The language of the document can be declared in the
The language is declared with the
Declaring a language is important for accessibility applications (screen readers) and search engines:
The first two letters specify the language (en). If there is a dialect, use two more letters (US).
title attribute is added to the
<p> element. The value of the title attribute will be displayed as a tooltip when you mouse over the paragraph:
The HTML5 standard does not require lowercase attribute names.
The title attribute can be written with uppercase or lowercase like title or TITLE.
W3C recommends lowercase in HTML, and demands lowercase for stricter document types like XHTML.
The HTML5 standard does not require quotes around attribute values.
href attribute, demonstrated above, can be written without quotes:
W3C recommends quotes in HTML, and demands quotes for stricter document types like XHTML.
Sometimes it is necessary to use quotes. This example will not display the title attribute correctly, because it contains a space:
Double quotes around attribute values are the most common in HTML, but single quotes can also be used.
In some situations, when the attribute value itself contains double quotes, it is necessary to use single quotes:
titleattribute provides additional "tool-tip" information
hrefattribute provides address information for links
heightattributes provide size information for images
altattribute provides text for screen readers
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