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277 lines
12 KiB
HTML
277 lines
12 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"[
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<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
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%brandDTD;
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]>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Viewing Page Info</title>
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<link rel="stylesheet" href="chrome://help/locale/helpFileLayout.css"
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type="text/css"/>
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</head>
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<body>
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<h1 id="viewing_page_info">Viewing Page Info</h1>
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<p>The Page Info dialog box consists of several tabs that display different
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kinds of information about the page you are viewing. This section provides a
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brief overview of the information available in each tab.</p>
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<p>To view Page Info for the page currently displayed by the browser, open the
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View menu and choose Page Info. You can then click the tab that corresponds
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to the kind of information you want to view.</p>
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<p>Most of the information displayed by the General, Forms, Links and Media
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tabs in Page Info is taken from the HTML source for the page. This
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information is usually of interest only to web developers and other
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specialists.</p>
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<p>For detailed information about HTML, including the tags displayed by Page
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Info, see the <a href="http://www.w3.org/TR/REC-html40/">HTML 4.01
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Specification</a>.</p>
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<p>The Privacy and Security tabs include information about the
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<a href="glossary.xhtml#p3p">Platform for
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Privacy Preferences (P3P)</a> policies of the website whose page you are
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viewing and the security status of that page.</p>
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<div class="contentsBox">In this section:
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<ul>
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<li><a href="#general_tab">General Tab</a></li>
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<li><a href="#forms_tab">Forms Tab</a></li>
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<li><a href="#links_tab">Links Tab</a></li>
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<li><a href="#media_tab">Media Tab</a></li>
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<li><a href="#privacy_tab">Privacy Tab</a></li>
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<li><a href="#security_tab">Security Tab</a></li>
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</ul>
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</div>
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<h2 id="general_tab">General (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu, the General tab displays basic
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information about the page that you are viewing in the browser.</p>
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<p>The top portion displays the the name of the page (if it has one) and the
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following information:</p>
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<ul>
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<li><strong>URL</strong>: The
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<a href="glossary.xhtml#url">Uniform Resource Locator</a> for the
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page—that is, the standardized address that appears in the Location
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Bar near the top of the browser window.</li>
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<li><strong>Render mode</strong>: Indicates whether the browser is using
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<strong>quirks mode</strong> or <strong>standards compliance mode</strong>
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to lay out the page. Quirks mode takes account of nonstandard behavior that
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may be used by some older web pages designed for older versions of web
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browsers that are not fully standards compliant. Standards compliance mode
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adheres strictly to standards specifications. Your browser chooses the
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render mode automatically according to information contained in the web
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page itself.</li>
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<li><strong>Source</strong>: Indicates whether the source code for this page
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has been cached.</li>
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<li><strong>Encoding</strong>: The character encoding used for this HTML
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document.</li>
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<li><strong>Size</strong>: The size of the file, if available.</li>
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<li><strong>Modified</strong>: The date the page was last modified, if
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available.</li>
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<li><strong>Expires</strong>: The date on which the information displayed by
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the page expires.</li>
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</ul>
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<p>The bottom portion displays the metatags specified by the page. Metatags
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provide information about the type of content displayed by a page, such as a
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general description of the page, keywords for search engines, copyright
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information, and so on.</p>
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<h2 id="forms_tab">Forms (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu and click the Forms tab, you
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see information about all the forms displayed by the page you are currently
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viewing in the browser.</p>
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<p>The top portion lists basic information about the way each form in the page
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is specified in the HTML source:</p>
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<ul>
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<li><strong>Name</strong>: The form's name, if any.</li>
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<li><strong>Method</strong>: The HTML method used to send information
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captured by the form back to the web server. <tt>GET</tt> appends your
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filled-in values to the website address to which it submits the form.
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<tt>POST</tt> sends the values to the website as parameters that can be
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read by a program on the website.</li>
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<li><strong>Form Action</strong>: The URL of the program to be invoked when
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the form is submitted.</li>
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</ul>
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<p>When you select a form listed in the top portion of the Forms tab, the
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bottom portion displays detailed information about the way each of of that
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form's elements is specified in the HTML source:</p>
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<ul>
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<li><strong>Label</strong>: The element's label (if it is tagged as such
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in the HTML).</li>
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<li><strong>Field Name</strong>: The element's name.</li>
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<li><strong>Type</strong>: The element's input type, such as
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<tt>TEXT</tt> (for submitting text), <tt>RADIO</tt> (for a radio button),
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or <tt>HIDDEN</tt> (for storing information that is submitted but not
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displayed on the screen).</li>
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<li><strong>Current Value</strong>: The current value of the element. For
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example, the current value of a text element is the text it currently
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contains.</li>
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</ul>
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<h2 id="links_tab">Links (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu and click the Links tab, you
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see a list of all the links available on that page. The following information
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is displayed for each link:</p>
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<ul>
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<li><strong>Name</strong>: The text displayed in the browser as a link.</li>
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<li><strong>Address</strong>: The <a href="glossary.xhtml#url">URL</a> for the
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page to which the link points.</li>
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<li><strong>Type</strong>: The type of link, such Anchor (for a link to a
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specific place in an HTML document) or Form Submission.</li>
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</ul>
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<h2 id="media_tab">Media (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu and click the Media tab, you
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see a list of all the images and other media elements displayed by the
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page.</p>
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<p>The top portion lists basic information about each element, including its
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address (<a href="glossary.xhtml#url">URL</a>) and type.</p>
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<p>When you select a media element listed in the top portion of the Media tab,
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the bottom portion displays available information about that element, such as
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description, size, or dimensions.</p>
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<p>You can also see the selected element at the bottom of the dialog box. To
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see larger images, you need to click the lower-right corner of the Page Info
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dialog box and drag.</p>
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<p>To save a media element as a separate file:</p>
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<ul>
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<li><strong>Save As</strong>: Select the element you want to save, click Save
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As, and navigate to the location where you want to save it.</li>
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</ul>
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<h2 id="privacy_tab">Privacy (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu and click the Privacy tab, you
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see a list of all the special elements that are part of the page.</p>
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<ul>
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<li><strong>Page Components</strong>: Under the page URL, there are many
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categories. To see the list of items in any category, click on the name:
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<ul>
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<li><strong>Links</strong>: Shows all of the links.</li>
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<li><strong>Java Applets</strong>: Lists the Java applets (if any).</li>
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<li><strong>Image Maps</strong>: Shows all of the image maps.</li>
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<li><strong>Form Submissions</strong>: List the script names used to
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gather used data on the page.</li>
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<li><strong>Frames</strong>: Shows the frames which make up the page.</li>
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<li><strong>Images</strong>: Displays all of the images used in the
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page.</li>
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<li><strong>External Loaded Documents</strong>: Contains the list of the
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external documents loaded to display the page (such as css files or
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images).</li>
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<li><strong>Generic Objects</strong>: Shows a list of generic
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objects.</li>
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<li><strong>Scripts</strong>: Lists all of the scripts in the page.</li>
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</ul>
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</li>
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<li><strong>Policy</strong>: This button will try to open the policy file for
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the site whose page is currently shown.</li>
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<li><strong>Summary</strong>: Select this if you want to view the Privacy
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Policy Viewer, showing concise data about the privacy policy of the site
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you are browsing.</li>
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<li><strong>Options</strong>: This will try to open the page on the remote
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site that allows the user to modify his/her own personal data stored on the
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remote site.</li>
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</ul>
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<p><strong>Note</strong>: The sites with a published privacy policy are not
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very common, so you will usually not see this tab while inspecting pages on
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the Web.</p>
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<h2 id="security_tab">Security (Page Info Tab)</h2>
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<p>When you choose Page Info from the View menu and click the Security tab, you
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see information about
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<a href="glossary.xhtml#authentication">authentication</a> and
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<a href="glossary.xhtml#encryption">encryption</a> for the web page you are
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viewing. The top portion indicates whether the website's identity has
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been verified, and the bottom portion describes whether the page was
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encrypted when it was received by the browser.</p>
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<p>You can also open the Security tab directly by clicking the lock icon in the
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lower-right corner of any browser window.</p>
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<p>The top portion of the Security tab can display any of these messages:</p>
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<ul>
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<li><strong>Website Identity Not Verified</strong>: The website you are
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viewing did not present a certificate to authenticate itself. Therefore,
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Certificate Manager cannot verify its identity. It is possible, though
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unlikely, that the website is not what it claims to be.</li>
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<li><strong>Website Identity Verified</strong>: The certificate that
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Certificate Manager has used to verify this website's identity was
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issued by a certificate authority (CA) marked as one that you trust. You
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can be reasonably confident that the website is what it claims to be.</li>
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</ul>
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<p>The bottom portion of the Security tab can display any of these
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messages:</p>
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<ul>
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<li><strong>Connection Not Encrypted</strong>: It is possible that other
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people can view information sent from your computer to the website or
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information sent by the website to your computer, but it is unlikely that
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someone is actually doing so.</li>
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<li><strong>Connection Encrypted</strong>: In general, the strength of an
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encrypted connection depends on the length of the keys used for encryption,
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measured in bits. The longer the key, the stronger the
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encryption—that is, the harder it is to for an unauthorized person to
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unscramble the encrypted information.
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<p>The Page Info window describes encryption strength in one of three
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ways:</p>
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<ul>
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<li><strong>High-grade encryption</strong>: Strongest encryption
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available, using 128-bit keys at a minimum.</li>
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<li><strong>Medium-grade encryption</strong>: Somewhat stronger than
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low-grade encryption, using 56- or 64-bit keys.</li>
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<li><strong>Low-grade encryption</strong>: Weakest encryption available,
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using 40-bit keys.</li>
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</ul>
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<p>Most websites support high-grade encryption. If you are viewing an older
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website that supports a weaker form of encryption, it is possible that
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other people can view information sent from your computer to the website
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or information sent by the website to your computer, but it is unlikely
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that someone is actually doing so.</p>
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</li>
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</ul>
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<p>Lack of any encryption or lack of strong encryption should be of concern
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only if you are sending or viewing confidential information, such as your
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credit card number.</p>
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<p>You can quickly check the encryption status of a web page by noting the
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state of the lock icon at the bottom-right corner of the browser window. For
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more details, see
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<a href="using_certs_help.xhtml#checking_security_for_a_web_page">Checking
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Security for a Web Page</a>.</p>
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<p>Copyright © 2003-2010 The Mozilla Foundation.</p>
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</body>
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</html>
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