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One important aspect of developing a web page is planning especially when it comes to organizing sections of content on that page A great strength of style sheets is the ability to easily apply groups of formatting characteristics to whole sections of text For example, suppose you have three paragraphs and a list making up the main body copy of a page, and you want to see how the text in that section looks with a different font face and size With the old font tag you would need to make multiple code changes just to try a different font But as long as you ve organized your content appropriately and used style sheets, the code changes will be minimal The key to all this is the div tag Amazingly, adding a simple <div> to the code on your page will cause no outward change in appearance when viewed in the browser In fact, the div tag does nothing by itself it doesn t even cause a line break It is simply used as a container, allowing you to manipulate its contents later with style sheets
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Identifying Natural Divisions
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It s normal for a web page to have natural divisions according to the type of content found in each area of the page A few common divisions or sections of a page might include the navigation, the body copy, the header, and the footer The code used to separate each section might look similar to the following:
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<body> <div id="header"> Header content goes here </div> <div id="bodyCopy"> Body copy goes here </div> <div id="footer"> Footer content goes here </div> </body>
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Notice I didn t use any spaces when assigning names to my divs Instead, I added a capital letter to help readability when multiple words were used in a single div name
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Once you ve set up basic divisions like this leaving the formatting to CSS instead of the HTML tables the possibilities are endless Need to move the navigation from the top of your page to the bottom on ten different pages If you put all of it into its own div piece of cake! Not only is it easy to move that entire navigation bar, you only have to edit the style sheet and not the individual HTML pages to do so
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DIV + ID
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When using the div tag to separate content areas, you also need to add the id attribute to give each division a name (as I did with header, bodyCopy, and footer in the previous code example) In the same way that a unique Social Security number is assigned as identification ID for each person living in the US, so should a unique name be given to each division on a web page Once you ve named your divisions, these content areas can easily be formatted in the site s style sheet, which might look something like the following:
#header {border: 1px;} #bodyCopy {font-family: Verdana; font-size: 12pt;} #footer {font-size: 10pt;}
In the style sheet, the # before each content area name is necessary because this isn t a normal style sheet selector Instead of using a tag as my selector, like p, I ve essentially made up my own selectors and given them names like header and footer And because I used the id attribute to do so, I prefaced my selector name with a hash mark (#)
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SPAN + CLASS
Similar to the div tag, the span tag also doesn t have any distinct HTML characteristics of its own The difference with the span tag is that it is best used to style inline as opposed to container-level bits of content So while you might use the div tag to add a colored background behind whole sections of your page, you would use the span tag to highlight a single word or phrase within a paragraph The following shows some code that illustrates this:
<head> <style type="text/css"> #introCopy {background-color: #cccccc;} highlight {background-color: #ffcc66;} </style> </head> <body> <div id="introCopy"> <p>Paragraph 1</p> <p>Paragraph 2</p> </div> <p>Paragraph <span class="highlight">3</span></p> <p>Paragraph 4</p> </body>
You ll notice I added a hash mark (#) before "introCopy", and a period before "highlight" The difference is simple: "introCopy" was created with an id attribute, whereas "highlight" was created with the class attribute Even though I named them both, they need to be prefaced by specific characters to let the browser know where to find them in the rest of the code (in other words, they should follow id or class attributes) So, when you use the class attribute, you always preface the class name with a period in your stylesheet Likewise, you use a hash mark or pound sign before your id names
While there are many people in a class, your personal identification (ID) is unique to you This holds true in CSS id selectors can only be used once on a page, whereas classes can be repeated as many times, and in as many tags, as necessary
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