1. 4.8.15 MathML
      2. 4.8.16 SVG
      3. 4.8.17 Dimension attributes

4.8.15 MathML

HTML/HTML5/HTML5_Parser#Inline_SVG_and_MathML_support

Support in all current engines.

Firefox4+Safari5.1+Chrome7+
Opera11.6+Edge79+
Edge (Legacy)12+Internet Explorer9+
Firefox Android5+Safari iOS5+Chrome Android18+WebView Android3+Samsung Internet1.0+Opera Android12+

The MathML math element falls into the embedded content, phrasing content, flow content, and palpable content categories for the purposes of the content models in this specification.

When the MathML annotation-xml element contains elements from the HTML namespace, such elements must all be flow content.

When the MathML token elements (mi, mo, mn, ms, and mtext) are descendants of HTML elements, they may contain phrasing content elements from the HTML namespace.

The semantics of MathML elements are defined by MathML and other applicable specifications. [MATHML]

Here is an example of the use of MathML in an HTML document:

<!DOCTYPE html>
<html lang="en">
 <head>
  <title>The quadratic formula</title>
 </head>
 <body>
  <h1>The quadratic formula</h1>
  <p>
   <math>
    <mi>x</mi>
    <mo>=</mo>
    <mfrac>
     <mrow>
      <mo form="prefix">−</mo> <mi>b</mi>
      <mo>±</mo>
      <msqrt>
       <msup> <mi>b</mi> <mn>2</mn> </msup>
       <mo>−</mo>
       <mn>4</mn> <mo>⁢</mo> <mi>a</mi> <mo>⁢</mo> <mi>c</mi>
      </msqrt>
     </mrow>
     <mrow>
      <mn>2</mn> <mo>⁢</mo> <mi>a</mi>
     </mrow>
    </mfrac>
   </math>
  </p>
 </body>
</html>

4.8.16 SVG

HTML/HTML5/HTML5_Parser#Inline_SVG_and_MathML_support

Support in all current engines.

Firefox37+Safari11.1+Chrome7+
Opera15+Edge79+
Edge (Legacy)12+Internet Explorer10+
Firefox Android37+Safari iOS11.3+Chrome Android18+WebView Android4.4+Samsung Internet4+Opera Android15+

The SVG svg element falls into the embedded content, phrasing content, flow content, and palpable content categories for the purposes of the content models in this specification.

When the SVG foreignObject element contains elements from the HTML namespace, such elements must all be flow content.

The content model for the SVG title element inside HTML documents is phrasing content. (This further constrains the requirements given in SVG 2.)

The semantics of SVG elements are defined by SVG 2 and other applicable specifications. [SVG]

doc = iframe.getSVGDocument()
doc = embed.getSVGDocument()
doc = object.getSVGDocument()

Returns the Document object, in the case of iframe, embed, or object elements being used to embed SVG.

4.8.17 Dimension attributes

The width and height attributes on img, iframe, embed, object, video, source when the parent is a picture element and, when their type attribute is in the Image Button state, input elements may be specified to give the dimensions of the visual content of the element (the width and height respectively, relative to the nominal direction of the output medium), in CSS pixels. The attributes, if specified, must have values that are valid non-negative integers.

The specified dimensions given may differ from the dimensions specified in the resource itself, since the resource may have a resolution that differs from the CSS pixel resolution. (On screens, CSS pixels have a resolution of 96ppi, but in general the CSS pixel resolution depends on the reading distance.) If both attributes are specified, then one of the following statements must be true:

The target ratio is the ratio of the natural width to the natural height in the resource. The specified width and specified height are the values of the width and height attributes respectively.

The two attributes must be omitted if the resource in question does not have both a natural width and a natural height.

If the two attributes are both 0, it indicates that the element is not intended for the user (e.g. it might be a part of a service to count page views).

The dimension attributes are not intended to be used to stretch the image.