The HTML <head> Element The <head> element is a container for metadata (data about data) and is placed between the <html> tag and the <body> tag. HTML metadata is data about the HTML document. Metadata is not displayed. Metadata typically define the document title, character set, styles, links, scripts, and other meta information. The following tags describe metadata: <title>, <style>, <meta>, <link>, <script>, and <base>. The HTML […]
HTML Layout Elements Websites often display content in multiple columns (like a magazine or newspaper). HTML5 offers new semantic elements that define the different parts of a web page: <header> – Defines a header for a document or a section <nav> – Defines a container for navigation links <section> – Defines a section in a […]
Reserved characters in HTML must be replaced with character entities. Characters that are not present on your keyboard can also be replaced by entities. HTML Entities Some characters are reserved in HTML. If you use the less than (<) or greater than (>) signs in your text, the browser might mix them with tags. Character […]
HTML Symbol Entities HTML entities were described in the previous chapter. Many mathematical, technical, and currency symbols, are not present on a normal keyboard. To add such symbols to an HTML page, you can use an HTML entity name. If no entity name exists, you can use an entity number, a decimal, or hexadecimal reference. […]
To display an HTML page correctly, a web browser must know which character set (character encoding) to use. What is Character Encoding? ASCII was the first character encoding standard (also called character set). ASCII defined 128 different alphanumeric characters that could be used on the internet: numbers (0-9), English letters (A-Z), and some special characters like ! […]
A URL is another word for a web address. A URL can be composed of words (w3schools.com), or an Internet Protocol (IP) address (192.68.20.50). Most people enter the name when surfing, because names are easier to remember than numbers. URL – Uniform Resource Locator Web browsers request pages from web servers by using a URL. […]
Links are found in nearly all web pages. Links allow users to click their way from page to page. HTML Links – Hyperlinks HTML links are hyperlinks. You can click on a link and jump to another document. When you move the mouse over a link, the mouse arrow will turn into a little hand. […]
Styling HTML with CSS CSS stands for Cascading Style Sheets. CSS describes how HTML elements are to be displayed on screen, paper, or in other media. CSS saves a lot of work. It can control the layout of multiple web pages all at once. CSS can be added to HTML elements in 3 ways: Inline – by using the style attribute in […]
HTML colors are specified using predefined color names, or RGB, HEX, HSL, RGBA, HSLA values. Color Names In HTML, a color can be specified by using a color name: Try it Yourself » Background Color You can set the background color for HTML elements: Example <h1 style=”background-color:DodgerBlue;”>Hello World</h1> <p style=”background-color:Tomato;”>Lorem ipsum…</p> Try it Yourself » Text Color […]
Comment tags are used to insert comments in the HTML source code. HTML Comment Tags You can add comments to your HTML source by using the following syntax: <!– Write your comments here –> Notice that there is an exclamation point (!) in the opening tag, but not in the closing tag. Note: Comments are not […]
The HTML Style Attribute Setting the style of an HTML element, can be done with the style attribute. The HTML style attribute has the following syntax: <tagname style=”property:value;“> The property is a CSS property. The value is a CSS value. You will learn more about CSS later in this tutorial. HTML Background Color The background-color property defines the background color for an HTML element. This example sets […]
The HTML <p> element defines a paragraph: Example <p>This is a paragraph.</p> <p>This is another paragraph.</p> Try it Yourself » Note: Browsers automatically add some white space (a margin) before and after a paragraph. HTML Display You cannot be sure how HTML will be displayed. Large or small screens, and resized windows will create different results. With HTML, you […]
Heading 1 Heading 2 Heading 3 Heading 4 Heading 5 Heading 6 HTML Headings Headings are defined with the <h1> to <h6> tags. <h1> defines the most important heading. <h6> defines the least important heading. Example <h1>Heading 1</h1> <h2>Heading 2</h2> <h3>Heading 3</h3> <h4>Heading 4</h4> <h5>Heading 5</h5> <h6>Heading 6</h6> Try it Yourself » Note: Browsers automatically add some white space (a margin) before and […]
About ink trapping When an offset printed document uses more than one ink on the same page, each ink must be printed in register(perfectly aligned) with any other inks that it abuts, so that there is no gap where the different inks meet. However, it’s impossible to ensure exact registration for every object on every sheet […]
About flattening If your document or artwork contains transparency, to be output it usually needs to undergo a process called flattening. Flattening divides transparent artwork into vector-based areas and rasterized areas. As artwork becomes more complex (mixing images, vectors, type, spot colors, overprinting, and so on), so does the flattening and its results. Flattening may be […]
Output Preview dialog box overview The Output Preview dialog box provides the tools and controls to help you simulate how your PDF looks in different conditions. The top part of the dialog box has several controls for previewing your document. The Preview menu allows you to switch between previewing separations and previewing color warnings. When you select […]
About printer marks in PDFs When you prepare a document for print production, a number of marks are needed to help the print service provider align separation films for producing proofs, measure film for correct calibration and ink density, trim film to size, and so on. Printer marks indicate the boundaries of document boxes supported […]
About output intents An output intent describes the final destination device you will use to reproduce the color in the PDF, such as the separations printing device. Output intents override working spaces during viewing and printing, but they do not convert the colors in the PDF. Note: In a PDF/X1-a workflow, the output intent describes the working […]
About preflight results You can view the results of a preflight inspection as a list, as comments, or individually in the Preflight dialog box. In the Results list, mismatches appear according to their severity, with all errors first, followed by warnings, and then just information. An alert icon appears next to each check that did […]
Viewing preflight problems inside the PDF structure For detailed information on PDF structure, see the documents on the Adobe PDF Technology Center at www.adobe.com/go/learn_acr_pdftechnology_en (English only). If you have advanced knowledge of the PDF file format, examine the internal structure of the PDF and its fonts for technical reasons for a preflight mismatch. Preflight includes three options for in-depth […]
