Adding images in page

HTML contains elements for adding images to your website.
The formats most used for the images added in a HTML page are GIF and JPEG (JPG ; JPE), the advantage of GIF images is that are small in size (in bytes), having a maximum of 256 colors.
Other format types that can be used are: PNG, BMP, TIFF, PCX

Adding image in HTML page

To add an image in a HTML document you can use the <img> tag and the following attributes:

src - Contains the location (URL address) of the file with the image.
alt - At this attribute you write the text that will appear if the image cannot be displayed.
width - The width of the image in pixels, if it's not specified the image will maintain it's original width.
height - The image's heigth, in pixels. If it's not specified the image will be presented in it's orininal heigth.

In the following example you can see how you can include an image in your web page and how to use these attributes:

<h4>Example adding image</h4>

<img src='../imgs/smile_gift.png' alt='smile' width='150' height='132'>

- In the <img> tag you can add the style attribute with CSS properties to set the border, position and margins for image.
Example::

<h4>Example image and style</h4>

<img src='../imgs/smile_gift.png' alt='smile' width='150' height='132' style='border:2px solid #0000ee; margin:5px 25px;'>

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Which attribute is used in <a> tag for the address of the link?

src href rel

<a href="http://coursesweb.net/" title="CoursesWeb.net">CoursesWeb.net</a>

Which CSS property sets the type of the text font?

font-family text-decoration font-size

h2 {
  font-family:"Calibri",sans-serif;
}

What instruction selects all the <div> tags with class="cls"?

querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")

var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
alert(nr_elms);

Indicate the function that can be used to get the sum of values in an array.

array_sum() array_diff() array_shift()

$arr =[1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10

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