file stringlengths 16 94 | text stringlengths 32 24.4k | vector list |
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http/reference/status/100/index.md | HTTP - Status - 100:
The HTTP `100 Continue` informational response status code indicates that the initial part of a request has been received and has not yet been rejected by the server. The client should continue with a request or discard the 100 response if the request is already finished.
When a request has an `E... | [
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http/reference/status/100/index.md | HTTP - Status - 100 - Status:
Example:
100 Continue | [
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http/reference/status/100/index.md | HTTP - Status - 100 - Examples - PUT request with 100 Continue:
The following `PUT` request sends information to a server about a file upload. The client is indicating that it will proceed with the content if it receives a 100 response to avoid sending data over the network that could result in an error like `405`, `4... | [
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http/reference/status/429/index.md | HTTP - Status - 429:
The HTTP `429 Too Many Requests` client error response status code indicates the client has sent too many requests in a given amount of time. This mechanism of asking the client to slow down the rate of requests is commonly called "`rate limiting`".
A `Retry-After` header may be included to this ... | [
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http/reference/status/429/index.md | HTTP - Status - 429 - Status:
Example:
429 Too Many Requests | [
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http/reference/status/429/index.md | HTTP - Status - 429 - Examples - Response containing Retry-After header:
The following request is being sent repeatedly in a loop by a client that is misconfigured:
Example:
GET /reports/mdn HTTP/1.1
Host: example.com
In this example, server-wide rate limiting is active when a client exceeds a set threshold of requ... | [
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http/reference/status/508/index.md | HTTP - Status - 508:
The HTTP `508 Loop Detected` server error response status code indicates that the entire operation failed because it encountered an infinite loop while processing a request with `Depth: infinity`.
The status may be given in the context of the Web Distributed Authoring and Versioning (`WebDAV`). I... | [
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http/reference/status/508/index.md | HTTP - Status - 508 - Status:
Example:
508 Loop Detected | [
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http/reference/status/508/index.md | HTTP - Status - 508 - Examples - Infinite loop in WebDAV search:
Example:
PROPFIND /Coll/ HTTP/1.1
Host: example.com
Depth: infinity
Content-Type: application/xml; charset="utf-8"
Content-Length: 125
<?xml version="1.0" encoding="utf-8" ?>
<D:propfind xmlns:D="DAV:">
<D:prop> <D:displayname/> </D:prop>
</D:propfin... | [
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http/reference/status/226/index.md | HTTP - Status - 226:
The HTTP `226 IM Used` successful response status code indicates that the server is returning a `delta` in response to a `GET` request. It is used in the context of HTTP delta encodings.
IM stands for instance manipulation, which refers to the algorithm generating a delta. In delta encoding, a cl... | [
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http/reference/status/226/index.md | HTTP - Status - 226 - Status:
Example:
226 IM Used | [
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http/reference/status/226/index.md | HTTP - Status - 226 - Examples - Receiving a `208` with the `vcdiff` delta algorithm:
In the following `GET` request, a client requests a resource and has a cached version with the ETag `abcd123`. The `A-IM:` header indicates a preference for `vcdiff` and `diffe` delta algorithms:
Example:
GET /resource.txt HTTP/1.1... | [
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http/reference/status/428/index.md | HTTP - Status - 428:
The HTTP `428 Precondition Required` client error response status code indicates that the server requires the request to be conditional.
Typically, a 428 response means that a required precondition header such as `If-Match` is missing. When a precondition header does not match the server-side sta... | [
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http/reference/status/428/index.md | HTTP - Status - 428 - Status:
Example:
428 Precondition Required | [
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http/reference/status/428/index.md | HTTP - Status - 428 - Examples - Missing precondition in request:
A client has fetched a resource `my-document` from the server, updated it locally, and then tries to send the updated document back to the server:
Example:
PUT /docs/my-document HTTP/1.1
Host: example.com
Content-Type: application/json
{
[…]
The s... | [
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http/reference/status/502/index.md | HTTP - Status - 502:
The HTTP `502 Bad Gateway` server error response status code indicates that a server was acting as a gateway or `proxy` and that it received an invalid response from the upstream server.
This response is similar to a `500` response in the sense that it is a generic "catch-all" for server errors. ... | [
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http/reference/status/502/index.md | HTTP - Status - 502 - Status:
Example:
502 Bad Gateway | [
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http/reference/status/502/index.md | HTTP - Status - 502 - Examples - 502 gateway error response:
The following request tries to fetch a webpage, but receives a `502` response in return. The response body contains a page describing the server state with a link to a support page for visitors.
Example:
GET /highlights HTTP/1.1
Host: example.com
User-Agen... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form:
The `form` HTML attribute associates a form-associated element with a `form` element within the same document. This attribute applies to the `button`, `fieldset`, `input`, `object`, `output`, `select`, and `textarea` elements. | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Values:
The `id` of the `<form>` element that the element should be associated with. | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Usage notes:
By default, form controls are associated with their nearest ancestor `form` element, while form controls that are not nested within a `<form>` are not associated with any form. The `form` attribute enables overriding these default behaviors.
The `form` attribute of the `button`... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Usage notes - Associating with a non-ancestor form:
The `form` attribute can be used to associate a form control nested in one `<form>` with another `<form>`.
In this code example, the username `<input>` is nested within the `internalForm`, but the `form` attribute disassociates the control... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Usage notes - Non-inheritance of the `form` attribute:
The `form` attribute only associates the element on which it is set. The attribute behavior is not inherited. For example, when the `form` attribute is set on a `<fieldset>` element, it only associates the `<fieldset>`; it does not autom... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Usage notes - Form submission:
Including the `form` attribute does not mean the element will be submitted with the form. Only submittable elements, including `<button>`, `<input>`, `<select>`, and `<textarea>`, have their name and values submitted when their associated `<form>` is submitted.... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Examples - Basic example:
This example demonstrates how form-associated elements can be associated with a `<form>` element using the `form` attribute, even if they are not explicitly nested inside it. All of the form-associated elements shown in this example are associated with the `loginFor... | [
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html/reference/attributes/form/index.md | HTML - Attributes - form - Examples - Element associated with a different form:
In this example, we have two `<form>` elements: `parentForm` and `targetForm`. The `<button>` inside `parentForm` has its `form` attribute set to `targetForm`, disassociating it from its nearest ancestor `parentForm`, while associating it ... | [
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html/reference/global_attributes/spellcheck/index.md | HTML - Global attributes - spellcheck:
The `spellcheck` global attribute is an enumerated attribute that defines whether the element may be checked for spelling errors.
Note: This attribute is merely a hint for the browser: browsers are not required to check for spelling errors. Typically non-editable elements are no... | [
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html/reference/global_attributes/spellcheck/index.md | HTML - Global attributes - spellcheck - Security and privacy concerns:
Using spellchecking can have consequences for users' security and privacy. The specification does not regulate how spellchecking is done and the content of the element may be sent to a third party for spellchecking results (see enhanced spellchecki... | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover:
The `popover` global attribute is used to designate an element as a popover element. | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Value:
The `popover` attribute can take one of the following values:
- `"auto"`: `auto` popovers can be "light dismissed" — this means that you can hide the popover by clicking outside it or pressing the Esc key. Showing an `auto` popover will generally close other `auto` popovers... | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Description:
Popover elements are hidden via `display: none` until opened via an invoking/control element (i.e., a `<button>` or `<input type="button">` with a `popovertarget` attribute) or a `HTMLElement.showPopover()` call.
When open, popover elements will appear above all other... | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Examples - Making an element a popover:
The following code renders a button that, when activated, will open a popover element. This behavior can be achieved using HTML alone.
Example:
<button popovertarget="my-popover">Open Popover</button>
<div popover id="my-popover">Greetings... | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Examples - Nesting popovers:
In this example, a button opens a popover that contains additional nested popovers. The nested popovers can be opened without closing the original menu popover. | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Examples - Nesting popovers - HTML:
In the first part of the HTML, we create a `button` that will open the main popover, which is a menu containing a few options.
Example:
<header>
<button popovertarget="menu">Open Menu</button>
</header>
<main>
<!-- Page content goes here ... | [
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html/reference/global_attributes/popover/index.md | HTML - Global attributes - popover - Examples - Nesting popovers - CSS:
Example:
header {
display: flex;
justify-content: center;
}
header button {
margin: 0.4rem auto;
}
We've used anchor positioning to position the menu popover below the `<button>` and grid to lay out the menu items and info buttons.
Exampl... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image:
`input` elements of type `image` are used to create graphical submit buttons, i.e., submit buttons that take the form of an image rather than text.
Example:
<p>Sign in to your account:</p>
<div>
<label for="userId">User ID</label>
<input type="text" id="userId" name="userId" />
... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Value:
`<input type="image">` elements do not accept `value` attributes. The path to the image to be displayed is specified in the `src` attribute. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes:
In addition to the attributes shared by all `input` elements, `image` button inputs support the following attributes. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - alt:
The `alt` attribute provides an alternate string to use as the button's label if the image cannot be shown (due to error, a `user agent` that cannot or is configured not to show images, or if the user is using a screen reading device). If provided, it must... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - formaction:
A string indicating the URL to which to submit the data. This takes precedence over the `action` attribute on the `form` element that owns the `input`.
This attribute is also available on `<input type="submit">` and `button` elements. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - formenctype:
A string that identifies the encoding method to use when submitting the form data to the server. There are three permitted values:
- `application/x-www-form-urlencoded`: This, the default value, sends the form data as a string after `percent-encod... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - formmethod:
A string indicating the HTTP method to use when submitting the form's data; this value overrides any `method` attribute given on the owning form. Permitted values are:
- `get`: A URL is constructed by starting with the URL given by the `formaction`... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - formnovalidate:
A Boolean attribute which, if present, specifies that the form should not be validated before submission to the server. This overrides the value of the `novalidate` attribute on the element's owning form.
This attribute is also available on `<i... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - formtarget:
A string which specifies a name or keyword that indicates where to display the response received after submitting the form. The string must be the name of a browsing context (that is, a tab, window, or `iframe`. A value specified here overrides any ... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - height:
A number specifying the height, in CSS pixels, at which to draw the image specified by the `src` attribute. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - src:
A string specifying the URL of the image file to display to represent the graphical submit button. When the user interacts with the image, the input is handled like any other button input. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Additional attributes - width:
A number indicating the width at which to draw the image, in CSS pixels. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Obsolete attributes:
The following attribute was defined by HTML 4 for `image` inputs, but was not implemented by all browsers and has since been deprecated. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Obsolete attributes - usemap:
If `usemap` is specified, it must be the name of an image map element, `map`, that defines an image map to use with the image. This usage is obsolete; you should switch to using the `img` element when you want to use image maps. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Using image inputs:
The `<input type="image">` element is a `replaced element` (an element whose content isn't generated or directly managed by the CSS layer), behaving in much the same way as a regular `img` element, but with the capabilities of a submit button. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Using image inputs - Essential image input features:
Let's look at a basic example that includes all the essential features you'd need to use (These work exactly the same as they do on the `<img>` element.):
Example:
<input
id="image"
type="image"
width="100"
height="30"
a... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Using image inputs - Overriding default form behaviors:
`<input type="image">` elements — like regular submit buttons — can accept a number of attributes that override the default form behavior:
- `formaction`: The URI of a program that processes the information submitted by the inpu... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Using image inputs - Using the x and y data points:
When you submit a form using a button created with `<input type="image">`, two extra data points are submitted to the server automatically by the browser — `x` and `y`. You can see this in action in our X Y coordinates example.
When... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Using image inputs - Adjusting the image's position and scaling algorithm:
You can use the `object-position` property to adjust the positioning of the image within the `<input>` element's frame, and the `object-fit` property to control how the image's size is adjusted to fit within th... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - A login form:
The following example shows the same button as before, but included in the context of a typical login form. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - A login form - HTML:
Example:
<form>
<p>Login to your account</p>
<div>
<label for="userId">User ID</label>
<input type="text" id="userId" name="userId" />
</div>
<div>
<label for="pwd">Password</label>
<input type="password" id="pwd" name="pwd" />
... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - A login form - CSS:
And now some CSS to make the basic elements sit more neatly:
Example:
div {
margin-bottom: 10px;
}
label {
display: inline-block;
width: 70px;
text-align: right;
padding-right: 10px;
} | [
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... |
html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - Adjusting the image position and scaling:
In this example, we adapt the previous example to set aside more space for the image and then adjust the actual image's size and positioning using `object-fit` and `object-position`. | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - Adjusting the image position and scaling - HTML:
Example:
<form>
<p>Login to your account</p>
<div>
<label for="userId">User ID</label>
<input type="text" id="userId" name="userId" />
</div>
<div>
<label for="pwd">Password</label>
<input type="passw... | [
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html/reference/elements/input/image/index.md | HTML - Elements - input - image - Examples - Adjusting the image position and scaling - CSS:
Example:
div {
margin-bottom: 10px;
}
label {
display: inline-block;
width: 70px;
text-align: right;
padding-right: 10px;
}
#image {
object-position: right top;
object-fit: contain;
background-color: #dddddd... | [
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html/reference/elements/th/index.md | HTML - Elements - th:
The `<th>` HTML element defines a cell as the header of a group of table cells and may be used as a child of the `tr` element. The exact nature of this group is defined by the `scope` and `headers` attributes.
Example:
<table>
<caption>
Alien football stars
</caption>
<thead>
<tr>... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Attributes:
This element includes the global attributes.
- `abbr`: A short, abbreviated description of the header cell's content provided as an alternative label to use for the header cell when referencing the cell in other contexts. Some user-agents, such as screen readers, may present this de... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Attributes - Deprecated attributes:
The following attributes are deprecated and should not be used. They are documented below for reference when updating existing code and for historical interest only.
- `align` (deprecated): Specifies the horizontal alignment of the header cell. The possible `... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Usage notes:
- The `<th>` may only be used within a `tr` element.
- In simple contexts, using the `scope` attribute on header cells (`<th>` elements) is redundant because `scope` is inferred. However, certain assistive technologies may fail to infer correctly, so specifying header scope may impr... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples:
See `table` for a complete table example introducing common standards and best practices. | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Basic column and row headers:
This example uses `<th>` elements to introduce column and row headers in a basic table structure. | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Basic column and row headers - HTML:
The first row (`tr` element) contains the column headers (`<th>` elements), which act as "titles" for the columns to make it easier to understand the information in the columns and identify the data. To indicate that each column header relates to a... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Basic column and row headers - CSS:
Some basic CSS is used to style the table and its cells. We use CSS attribute selectors to target header cells based on their `scope` attribute values, highlighting column and row headers (`<th>` elements) and differentiating them each other and fro... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Column and row spanning:
This example extends and enhances the basic table from the previous example by adding a second row for additional column headers. | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Column and row spanning - HTML:
An additional table row (`tr` element) is added as the second header row of the table with two additional column headers (`<th>` elements). In this way, the "Pronunciation" column is split into two columns, one for the IPA (International Phonetic Alphab... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Column and row spanning - CSS:
The CSS is unchanged from the previous example.
Example:
table {
border-collapse: collapse;
border: 2px solid rgb(140 140 140);
font-family: sans-serif;
font-size: 0.8rem;
letter-spacing: 1px;
}
th,
td {
border: 1px solid rgb(160 160 160);... | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Associate header cells with other header cells:
For more complex relationships between header cells, using `th` elements with the `scope` attribute alone may not be sufficient for assistive technologies, especially screen readers. | [
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html/reference/elements/th/index.md | HTML - Elements - th - Examples - Associate header cells with other header cells - HTML:
To improve the `accessibility` of the previous example and to allow screen readers, for example, to speak the headers associated with each header cell, the `headers` attribute can be introduced along with `id` attributes. Because ... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe:
The `<iframe>` HTML element represents a nested `browsing context`, embedding another HTML page into the current one.
Example:
<iframe
id="inlineFrameExample"
title="Inline Frame Example"
width="300"
height="200"
src="https://www.openstreetmap.org/export/embed.html?bbox=-0.0040179... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Attributes:
This element includes the global attributes.
- `allow`: Specifies a Permissions Policy for the `<iframe>`. The policy defines what features are available to the `<iframe>` (for example, access to the microphone, camera, battery, web-share, etc.) based on the origin of the reques... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Attributes - Deprecated attributes:
These attributes are deprecated and may no longer be supported by all user agents. You should not use them in new content, and try to remove them from existing content.
- `align` (deprecated): The alignment of this element with respect to the surrounding ... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Scripting:
Inline frames, like `frame` elements, are included in the `window.frames` pseudo-array.
With the DOM `HTMLIFrameElement` object, scripts can access the `window` object of the framed resource via the `contentWindow` property. The `contentDocument` property refers to the `document`... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Scripting - Top navigation in cross-origin frames:
Scripts running in a same-origin frame can access the `Window.top` property and set `window.top.location` to redirect the top-level page to a new location. This behavior is referred to as "top navigation".
A cross-origin frame is allowed to... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Positioning and scaling:
Being a `replaced element`, the `<iframe>` allows the position of the embedded document within its box to be adjusted using the `object-position` property.
Note: The `object-fit` property has no effect on `<iframe>` elements. | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - `error` and `load` event behavior:
The `error` and `load` events fired on `<iframe>`s could be used to probe the URL space of the local network's HTTP servers. Therefore, as a security precaution user agents do not fire the error event on `<iframe>`s, and the load event is always triggered e... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Responsive `<iframe>` sizing:
For security and privacy reasons, `iframe` elements do not by default expose any information to the parent document about the size of the content in the document they are embedding.
To enable responsive sizing of `iframe` elements based on their content, the `<... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Accessibility:
People navigating with assistive technology such as a screen reader can use the `title` attribute on an `<iframe>` to label its content. The title's value should concisely describe the embedded content:
Example:
<iframe
title="Wikipedia page for Avocados"
src="https://en... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Examples - A basic iframe>:
This example embeds the page at https://example.org in an iframe. This is a common use case of iframes: to embed content from another site. For example, the live sample itself, and the try it example at the top, are both `<iframe>` embeds of content from another M... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Examples - A basic iframe> - HTML:
Example:
<iframe
src="https://example.org"
title="iframe Example 1"
width="400"
height="300">
</iframe> | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Examples - Embedding source code in an iframe>:
This example directly renders source code in an iframe. This can be used as a technique to prevent script injection when displaying user-generated content, when combined with the `sandbox` attribute.
Note that when using `srcdoc`, any relative... | [
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html/reference/elements/iframe/index.md | HTML - Elements - iframe - Examples - Embedding source code in an iframe> - HTML:
Example:
<article>
<footer>Nine minutes ago, <i>jc</i> wrote:</footer>
<iframe
sandbox
srcdoc="<p>There are two ways to use the <code>iframe</code> element:</p>
<ol>
<li><a href="about:srcdoc#embed_another">To embe... | [
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html/reference/elements/meta/name/index.md | HTML - Elements - meta - name:
The `name` attribute of the `meta` element provides metadata in name-value pairs. When a `<meta>` element has a `name` attribute, a `content` attribute defines the corresponding value. The metadata is document-level metadata that applies to the whole page.
For example, the following `<m... | [
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1.1463334560394287,
0.7402406334877014,
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0.09397892653942108,
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0.3597334623336792,
... |
html/reference/elements/meta/name/index.md | HTML - Elements - meta - name - Value - Meta names defined in the HTML specification:
The HTML specification defines the following set of standard metadata names:
- `application-name`: Browsers may use this to identify the application running in the web page. It is different from the `title` element, which may contai... | [
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html/reference/elements/meta/name/index.md | HTML - Elements - meta - name - Value - Meta names defined in other specifications:
- `responsive-embedded-sizing` (experimental): Opts in an embedded document to sharing its size information with the parent page. Defined in the CSS box sizing module.
- `text-scale` (experimental): Enables opting the page in to having... | [
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0.53302401304245,
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... |
html/reference/elements/meta/name/index.md | HTML - Elements - meta - name - Value - Meta names defined in the WHATWG MetaExtensions wiki:
The WHATWG Wiki MetaExtensions page contains a large set of non-standard metadata names. Some of the names included are used quite commonly in practice, notably the following:
- `creator`: The name of the creator of the docu... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale:
The `text-scale` value for the `name` attribute of a `meta` element enables opting the page in to having the `html` root element's initial `font-size` scale in proportion to OS and browser-level text scale settings.
Warning: If you include `<meta name="text-scale" content="... | [
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... |
html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Usage notes:
A `<meta name="text-scale">` element has the following additional attributes:
- `content`: Specifies the `font-size` scale opt-in behavior. Its value is a keyword, which can be one of the following:
- `scale`: Opts the page in to having the `html` root eleme... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Description:
The `<meta name="text-scale" content="scale" />` element can be included in a document's `head` to signal to the browser that the page is sized in a way that will scale well across various user-selected font size preferences; it also disables existing browser-b... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Description - Usage summary:
To summarize, set `scale` only if your app is designed to support font scaling. Recommended usage is to:
- Include `<meta name="text-scale" content="scale" />` in the `<head>` of your page.
- Don't override the initial `:root` `font-size` with ... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Description - `<meta name="text-scale">` versus `env(preferred-text-scale)`:
Using `<meta name="text-scale" />` to size dimensions relative to OS text scale settings is recommended over the `env(preferred-text-scale)` environment variable. They have similar effects on mobil... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Examples - Meta viewport text-scale demonstration:
This example demonstrates the effect of `<meta name="text-scale" content="scale">`. | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Examples - Meta viewport text-scale demonstration - HTML:
We include the `<meta name="text-scale" content="scale">` element in the document `<head>`, plus a `<meta name="viewport">` element to ensure correct display on mobile devices. We also include some text content insid... | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Examples - Meta viewport text-scale demonstration - CSS:
Text containers with a `class` of `text-scale` are given a `font-size` of `1rem`, which means that in browsers that support `<meta name="text-scale" content="scale">`, that text will scale as the OS/browser font setti... | [
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... |
html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Examples - A text-scale-responsive layout:
This example demonstrates that with `<meta name="text-scale">` applied to a page, font-relative sizes can be used inside `@media` queries to cause mobile browsers to automatically adjust breakpoints as the OS text size is changed. | [
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html/reference/elements/meta/name/text-scale/index.md | HTML - Elements - meta - name - text-scale - Examples - A text-scale-responsive layout - HTML:
Like the previous example, our markup again includes the `<meta name="text-scale">` and `<meta name="viewport">` elements in the `<head>`. In this demo, the body content contains two elements — `main` and `aside` — to repres... | [
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