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HTML <img width="742" height="556" src="cl1-99.jpg" alt="Crater Lake 1" /> <!-- Nonessential markup is not shown. --> CSS img { display:block; width:auto; height:auto; } /* Nonessential rules are not shown. */ Example The example contains eight different versions of a picture that I took of Crater Lake on August 4, 2003. The source image is 742!556 pixels with a file size of 1,238,822 bytes. I processed the image to create eight separate files each with a different image type and quality. The first image is a JPG image at maximum quality, which reduces the file size to 275,798 bytes. This is a reduction of 5 times. At a JPG s highest quality, it is difficult to see any loss of quality. The second image is a JPG at 90% quality, which reduces the file size to 81,248 bytes. This is a reduction of 15 times. At 90% quality, you can barely see a difference with a magnifying glass. You can see a difference in the third and fourth images, which are JPGs at 75% and 50% quality and 41,290 and 14,841 bytes. This is a reduction of 30 and 84 times. The fifth and sixth images are GIFs. These images have less quality and larger sizes than the JPG images. This is not a fair test of GIFs because they are not designed for real-world images containing thousands of colors. GIFs produce smaller files and have better quality when used for computer-generated images containing 256 or less colors. The seventh and eight images are PNGs. These images have the best quality with slightly smaller file sizes than the best-quality JPG, but there is no way to increase the compression to shrink the file size.

Figure 10-11. A select field using choice grouping Properties commonly used with the select element are #attributes, #default_value, #description, #multiple, #options, #prefix, #required, #suffix, #title, and #weight.

Problem Solution You want to insert an image into the document because it is part of the content You can insert an image into your document using <img> You can use the src attribute to specify the URL containing the image You should put a brief description of the image in the alt attribute This alternative description should be written specifically for screen readers to read and for displaying when the image fails to download Decorative images are best displayed as background images, but if you must use a decorative <img> element, include the alt attribute, but leave it empty Because a browser downloads each image separately, it needs to know the image s height and width so it can create a placeholder for the image while the image downloads Otherwise, after each image is downloaded and its real size becomes known, a browser has to reflow the page.

The default installation of any Microsoft Office product and the VBE do not require variable declaration before use. VBA will create the variable automatically the first time it is used. If you include a call to Option Explicit at the top of your code modules, VBA will require that each variable be declared before use.

This slows the rendering and annoys the user To set an image s size, you can use the width and height attributes of <img> or the width and height CSS properties There is no need to use both CSS properties override HTML attributes Pattern HTML <img src="FILEEXT" width="IMAGE_WIDTH" height="IMAGE_HEIGHT" alt="BRIEF_IMAGE_DESCRIPTION" /> This pattern applies to images An image is an inline element It vertically aligns to the baseline of the line in which it occurs You can use vertical-align to adjust the alignment When you want to treat an image as a block, you should use display:block to display it as a block This removes a small amount of extra space that a browser places below an image when it is inline, and it preserves the image s size when it fails to download JPG, GIF, and PNG are the most common types of images on the Internet.

Explicit helps the compiler catch any variable names you may have mistyped. It also helps you avoid confusion when the scope of a variable may not be clear.

Tip In elements that have options (that is, select fields, radios, and checkboxes) Drupal will automatically