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But it doesn’t work very well with large images. This technique is worthwhile if you’re trying to line up a very small picture, like a fancy bullet. It lines the picture up with the top of the line of text. Here’s an example that adds an inline style ( Using Inline Styles) to the image that sets the vertical-align property. You can use paragraphs, line breaks, or tables to do a better job of separating images from text. (To really prevent a missing picture from scrambling your layout, carve your pages into separate sections using elements, and position them with style sheets, as described in Chapter 8.)įigure 4-4. Usually, you don’t want a picture inside an ordinary line of text (unless it’s a very small emoticon, like the ones you find in instant message programs). However, you shouldn’t rely on this strategy, because it doesn’t work in Firefox-that browser ignores the height and width attributes for missing pictures, and it doesn’t display an image box.

#Web page refreshing for new blue titler live problem download#

The second reason is because the dimensions control the size of the picture box if a browser can’t download the image (see Figure 4-2, middle). This is potentially distracting if your visitors have slow connections and they’ve already started reading the page. On the other hand, if you don’t include the height and width attributes, the browser won’t know the dimensions of the picture until it’s fully downloaded, at which point it has to rearrange the content. As odd as this sounds, there are a couple of good reasons to do so.įirst, when you include image size attributes, browsers know how large a picture is and can start laying out a page even as the graphic downloads (see Figure 4-2, left). However, experienced web developers sometimes add them using the same dimensions as the actual picture. Many web page designers leave out image height and width attributes. On the other hand, if you create thumbnails in a graphics editor like Photoshop, the file sizes are smaller, ensuring that your pages download much more quickly.

But using the height and width attributes to scale down a large picture comes with a performance penalty-namely, the browser still needs to download the original, larger image, even though it displays it at a smaller size. Sometimes, novice web authors use them to make thumbnails, small versions of large pictures. If this is larger than the real dimensions of the photo01.jpg picture, the browser stretches and mangles the image to make it fit the size you set (see Figure 4-3).Īpproach height and width attributes with caution. In this markup, the element gives the picture a width of 100 pixels and a height of 150 pixels. However, the element lets you resize a picture through its optional height and width attributes. So if your picture is a gigantic 2000 x 4000 pixels, that’s what appears in your web page.

#Web page refreshing for new blue titler live problem full#

Ordinarily, a picture gets its full resolution. The web world doesn’t work with fixed units like inches and centimeters, because you never know how large your visitor’s monitor is, and therefore how many pixels it can cram in. A pixel represents one tiny dot on a computer screen.

Web weavers measure graphics in units called pixels. Picture dimensions are noteworthy because they determine how much real estate an image occupies onscreen. (We’ll talk about file sizes on Compression.) To web page creators, both measures are important, but this section is all about the physical dimensions. When it comes to pictures, the word size has two meanings: it can refer to the dimensions of the picture (how much screen space it takes up on a web page), or it can signify the picture’s file size (the number of bytes required to store it).

To add pop-up text, use the title attribute:

Web experts always use meaningful text when they write alt descriptions to ensure that screen readers and search engines interpret the corresponding pictures correctly.ĭon’t confuse alternate text with pop-up text, which is an optional message that appears when a website visitor points to an image (see Figure 4-2). The first two reasons are the most important. (Perhaps you forgot to copy it to your web server?)Ī web visitor switches off his browser’s ability to display pictures to save page-download time (this isn’t terribly common today).Ī browser doesn’t support images (this is understandably rare these days, too, but the text-only Lynx browser is still kicking around on some old Unix systems). A viewing-impaired visitor uses a screen-reading program (a program that “speaks” text, including the words in an alt attribute).Ī search engine (like Google) analyzes a page and all its content so it can index the content in a search catalog.Ī browser requests a picture but can’t find it.